23-25 September 2013
GEOMAR East shore
Europe/Berlin timezone
Home > Contribution List
Displaying 109 contributions out of 109
Type: Oral presentation, full-paper Session: 10: North America
Track: Oral presentations
A geomorphological analysis of the Veatch slide complex is presented here indicting the presence of at least two major slides presenting different morphological characteristics and involving different type of sediments (in terms of strength and grain size). These slides took place after the erosion of the Veatch Canyon which had been the locus of many bank failures. It is shown that a more refined ... More
Presented by Prof. Jacques LOCAT on 25 Sep 2013 at 13:30
Type: Oral presentation, full-paper Session: 09: Tsunami Models and Geotechnical Testing
Track: Oral presentations
Submarine landslides on open continental slopes can be far larger than any slope failure on land and occur in locations worldwide on gradients of <2°. Significantly elevated pore pressure is necessary to overcome the sediment's shearing resistance on such remarkably low gradients, but the processes causing such overpressure generation are contentious, especially in areas with slow sedimentation r ... More
Presented by Ms. Morelia URLAUB on 25 Sep 2013 at 10:15
Type: Oral presentation, full-paper Session: 02: Pore Fluids & Weak Layers
Track: Oral presentations
Flow-slides in submerged slopes in non-lithified sand and silt-sized sediments form a major threat for flood defences along (estuary) coastlines and riverbanks in the Netherlands. Flow slide is a complex failure mechanism including both soil mechanical and hydraulic features. Two important sub-mechanisms are static liquefaction and breaching. Both result in a flowing sand-water mixture, that event ... More
Presented by Dr. Geeralt VAN DEN HAM on 23 Sep 2013 at 12:15
Type: Oral presentation, full-paper Session: 09: Tsunami Models and Geotechnical Testing
Track: Oral presentations
This paper presents a case history showing how the integration of detailed geophysical and geotechnical data and advanced numerical modeling can overcome the limitations of conventional analysis in predicting seismic stability of deepwater slopes. Submarine landslides represent one of the most critical geohazards for offshore pipelines and deepwater hydrocarbon developments. This is particularly t ... More
Presented by Omar ZANOLI on 25 Sep 2013 at 10:00
Type: Oral presentation, full-paper Session: 07: Australia, Latin America
Track: Oral presentations
La Aguja Submarine Canyon (LASC) is a remarkable bathymetric feature that cuts the continental margin of the Colombian Caribbean Coast offshore of the Santa Marta massif. This section of the margin is strongly influenced by two active strike-slip fault systems: the NNW-trending Santa Marta – Bucaramanga Fault (SMBF) and the EW-trending Oca- Fault (OF). Based on 6500 km2 of high resolution multib ... More
Presented by Prof. Carlos Alberto VARGAS JIMENEZ on 24 Sep 2013 at 16:00
Type: Oral presentation, full-paper Session: 11: Indian Ocean and Asian Pacific
Track: Oral presentations
Ancient submarine slope failures are exposed in the Plio–Pleistocene trench–slope basin sediments of the Chikura Group. Based on the lateral tracing of a key tephra bed (“HF”) and the sedimentology and geological structure at seven exposures of the failure deposit over a total distance of 5 km, we identified at least 5 discrete failure events and evidence of lateral variation in the age of ... More
Presented by Dr. Yuzuru YAMAMOTO on 25 Sep 2013 at 15:30
Type: Poster presentation Session: Poster session
The strength parameters of marine sediments play an important role in the assessment of seabed slope stability. Laboratory and in situ tests are usually utilized to determine the sediment strength for engineering purposes. However, for marine sediments in water depth over hundreds of meters, it becomes difficult to carry out in situ tests and obtain undisturbed sediment samples for laboratory test ... More
Presented by Prof. Huai-Houh HSU on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 02: Pore Fluids & Weak Layers
Track: Oral presentations
A large-scale submarine landslide (Baiyun Slide) covering an area of 10,000 km2 was identified from the multibeam bathymetric data, high-resolution 2D and 3D seismic data acquired in the Baiyun Sag, Pearl River Mouth Basin, northern South China Sea (SCS). Numerous polygonal faults are also found below the translational domain of the Baiyun Slide. Enhanced reflections, bright spots and pull-down re ... More
Presented by Mr. Wei LI on 23 Sep 2013 at 12:45
Type: Poster presentation Session: Poster session
Track: Poster presentations
Downslope mass movement involves changes in material properties and rheology induced by compactional dewatering and shear strains. The structures and kinematics indicative of these strains are very complex; they have been described in seismic data (e.g. Bull et al., 2009), but equivalent structures may be very difficult to identify in outcrop studies, largely due to the large scale difference. ... More
Presented by Mr. Matheus Silveira SOBIESIAK on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Similarly to steep oceanic continental margins, lake slopes can collapse, producing large sublacustrine landslides and tsunamis. Lake sediments are excellent natural archives of such mass movements and their studies allow the reconstruction of these events on historic and prehistoric timescales. In Lake Geneva (central basin, called ‘Grand-lac’), more than 100 km of high-resolution seismic r ... More
Presented by Katrina KREMER on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
High-resolution 2-D multichannel seismic data, combined with high-precision multibeam bathymetric relief map, were utilized to investigate the characteristics and distribution of submarine landslides in Shenhu area in the upper slope of northern South China Sea (SCS) margin. In the region, a set of submarine canyons are developed. The canyons are 2-4 km apart, and are separated by sedimentary ridg ... More
Presented by Mr. Zenggui KUANG, Prof. Liaoliang WANG, Prof. Yiqun GUO on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
The area off SW Taiwan is situated in an active convergent margin where the Eurasian Plate subducts eastwards beneath the Philippine Sea Plate. Because of the collision of the Luzon Arc (situated on the Philippine Sea Plate) against the Eurasian Plate margin, the area off SW Taiwan is also in an initial stage of orogeny. On the other hand, the area off SW Taiwan has a wide distribution of BSR (Bot ... More
Presented by Prof. Shu-Kun HSU on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 03: Pore Fluids & Microfabrics
Track: Oral presentations
Submarine landslides are a potential risk to coastal areas all over the world. Studies of mass transport deposit (MTD) contribute to our understanding of the nature and process of submarine landslides. Scientific drilling provides material containing geological records of past landslide events. However, MTDs may not always be uniquely discernible by visual inspection. We applied magnetic fabric an ... More
Presented by Dr. Yujin KITAMURA on 23 Sep 2013 at 14:45
Type: Oral presentation, full-paper Session: 07: Australia, Latin America
Track: Oral presentations
Offshore Costa Rica large seamounts under-thrust the continental convergent margin causing slides of complex morphology. The large dimension of the structures has attracted previous investigations and their basic characteristics are known. However, no detailed mapping of their complex morphology has been reported. Here we present a detailed mapping of the failure-related structures and deposits. W ... More
Presented by Dr. Rieka HARDERS on 24 Sep 2013 at 14:30
Type: Poster presentation Session: Poster session
Offshore Costa Rica large seamounts under-thrust the continental convergent margin causing slides of complex morphology. The large dimension of the structures has attracted previous investigations and their basic characteristics are known. However, no detailed mapping of their complex morphology has been reported. Here we present a detailed mapping of the failure-related structures and deposits. W ... More
Presented by Dr. Rieka HARDERS on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 01: The Italian experience
Track: Oral presentations
High-resolution multibeam bathymetry is used as basis for detecting instability processes on the Tyrrhenian margin offshore Calabria (Italy). Among the many evidence at different spatial scale, we focus on selected cases that may represent a potential geohazard because of their scale, shallow/proximal location and state of activity. These include failures along coastal cliffs and canyon headwalls ... More
Presented by Dr. Daniele CASALBORE on 23 Sep 2013 at 11:45
Type: Oral presentation, full-paper Session: 10: North America
The deep-water, sediment-starved Rockall Trough separates the western Irish shelf from the Rockall Bank. Both margins have narrow, steep slopes that connect the continental shelf with the deeper basin but differ in their underlying geological controls and sediment transport processes. We compare and contrast the opposing margins of the Rockall Trough and review the size, depth distribution and deg ... More
Presented by Dr. Aggeliki GEORGIOPOULOU on 25 Sep 2013 at 13:45
Type: Oral presentation, full-paper Session: 11: Indian Ocean and Asian Pacific
Track: Oral presentations
In order to understand how the variations in shelf morphology and sediment supply to the shelf within a basin can change the occurrence styles of slope failures and mass-transport deposits (MTDs), this paper details dimensions and morphology of the latest Quaternary slope failures and MTDs on the western and southern margins of the Ulleung Basin. On the western margin, the slides and slumps have r ... More
Presented by Dr. Sang Hoon LEE on 25 Sep 2013 at 15:45
Type: Oral presentation, full-paper Session: 10: North America
Track: Oral presentations
Globally widespread gas hydrates are proposed to stabilize the seafloor by increasing sediment peak shear strength; while seafloor failure localises at the base of the gas hydrate stability field (BGHS). The primary mechanism by which gas hydrates are proposed to induce slope failure is by temperature or pressure controlled dissociation of hydrate to free gas resulting in a significant pore pressu ... More
Presented by Dr. Joshu MOUNTJOY on 25 Sep 2013 at 14:00
Type: Oral presentation, full-paper Session: 09: Tsunami Models and Geotechnical Testing
Track: Oral presentations
The slope of the Fraser delta is prone to failure. At least six independent mechanisms have been hypothesized. Modeling by Fisheries and Oceans Canada shows that a large magnitude slide would generate a tsunami large enough to impact lives in communities of Metro Vancouver and damage hundreds of millions of dollars worth of infrastructure. Although slides of this magnitude are mostly hypothetical, ... More
Presented by Dr. Gwyn LINTERN on 25 Sep 2013 at 11:30
Type: Poster presentation Session: Poster session
Track: Poster presentations
A multicomponent ocean-bottom seismometer data set was collected by National Central University, Taiwan in the accreationary prism off southwestern Taiwan in April 2013. The OBS contains four component receivers, including a three component 4.5 Hz geophone unit containing three orthogonal components and a hydrophone. GI-gun shots located at 1 mile radius from the OBS, with spacing approximately 40 ... More
Presented by Prof. Win Bin CHENG on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
The deposits of two submarine landslides were cored at Site C0021B in the Nankai Trough during Integrated Ocean Drilling Program (IODP) Expedition 338. Mass transport deposits (MTDs) are identified at 94-117 meters below seafloor (mbsf) and 133-176 mbsf by decreased porosity, tilted bedding, and semi-transparent seismic facies. Grain size analyses documented that sediment samples from 0-194 mbsf c ... More
Presented by Mr. Zachary MOORE on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
The 2007 Mw 6.2 earthquake in Aysén fjord caused not only onshore mass movements, but also widespread basin-plain deformation and density-flows. Deformed basin-plain deposits are mapped using multibeam bathymetry and seismic-reflection (sparker) profiling. To better understand the facies successions in, and the intercalation of, the (distal) density-flow deposits, we also studied the 2007 deposit ... More
Presented by Dr. Maarten VAN DAELE on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 03: Pore Fluids & Microfabrics
Track: Oral presentations
This study presents a detailed characterization of the sedimentology, microfabric and elemental distributions across a prominent unconformity drilled at 78 meters below sea floor at Integrated Ocean Drilling Program (IODP) Site C0004 in the Nankai accretionary prism, offshore Japan. This stratigraphic contact has previously been interpreted as buried landslide scar, which likely experienced multip ... More
Presented by Ms. Helen Eri AMSLER on 23 Sep 2013 at 15:00
Type: Oral presentation, full-paper Session: 11: Indian Ocean and Asian Pacific
Track: Oral presentations
Several studies indicate that the 2011 Tohoku-Oki earthquake (Mw 9.0) off the Pacific coast of Japan has induced slip to the trench and triggered landslides in the Japan Trench. In order to better understand these processes, detailed mapping and shallow-coring landslides at the trench as well as Integrated Ocean Drilling Program (IODP) deep drilling to recover the plate boundary décollement (Japa ... More
Presented by Dr. Hiske FINK on 25 Sep 2013 at 15:15
Type: Oral presentation, full-paper Session: 01: The Italian experience
Track: Oral presentations
Mt. Etna is the largest and one of the best-studied volcanoes in Europe. It represents a highly active basaltic volcano on top of the active Apennine thrust belt. The instability of its eastern flank has been described as an important preconditioning factor for the occurrence of submarine mass wasting events. In order to better understand the processes that may cause submarine slope failures, a ne ... More
Presented by Mr. Felix GROSS on 23 Sep 2013 at 10:30
Type: Oral presentation, full-paper Session: 02: Pore Fluids & Weak Layers
Track: Oral presentations
Many flood defences in The Netherlands have been disapproved for flow slides of the Holocene subsoil. Traditionally these flow slides are assumed to be induced by static liquefaction. Only in recent times it has been recognized that flow slides may also concern breach flows, which do not necessarily require loosely packed sand. For both static liquefaction and breach flow the inaccuracy of the cur ... More
Presented by Mr. Alexander VAN DUINEN on 23 Sep 2013 at 12:30
Type: Oral presentation, full-paper Session: 03: Pore Fluids & Microfabrics
Track: Oral presentations
On the central Nile deep-sea fan, stratified sediments overlying mass-transport deposits (MTDs) are deformed into slope-parallel seabed undulations associated with fluid seepage. The western part of this system, in water depths of 1950-2250m, is examined using multi-frequency data from hull-mounted and deep-towed swath/profiling systems. Sub-bottom profiles show sub-vertical fluid pipes that termi ... More
Presented by Daniel PRAEG on 23 Sep 2013 at 14:30
Type: Poster presentation Session: Poster session
Submarine slop failures are a wide spread phenomena and a huge geo hazard. They reshape margin landscapes and can destroy seafloor installations or even coastal infrastructure by generating tsunamis. The mechanisms that create submarine landslides at continental margins are believed to be related to rapidly deposited glacigenic material generating overpressure in previously deposited hemi-pelagic ... More
Presented by Elger JUDITH on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Based on the data from the multi-beam bathymetric survey, the sub-bottom profiling and the high-resolution multi-channel seismic exploration carried out in the Liwan 3-1 Gas Field, the first deep-water gas field in China, the geo-hazard types that have been identified along the deep section of the submarine pipeline route in the area studied include submarine canyons, seafloor landslides and coll ... More
Presented by Dr. Lejun LIU on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Submarine landslides are ubiquitous along Mediterranean continental margins. With the aim to understand mass wasting processes and related hazard at the scale of a large marine basin encompassing multiple geological settings, we have compiled data on their geometry, age, and trigger mechanism with a geographic information system. The distribution of submarine landslides in the Mediterranean reveal ... More
Presented by Dr. Roger URGELES on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
Pantelleria Volcano is well known for its subaerial activity and as the type locality for pantellerite rocks. However, the last eruption (1891) was submarine occurring 5 km W-NW of Pantelleria harbor. Recent high-resolution mapping offshore Pantelleria volcano has revealed a complex seafloor morphology characterized by volcanic features mostly represented by lava flows, volcanic outcrop remnants a ... More
Presented by Dr. Marilena CALARCO on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
Topographic and geologic features of a mass failure zone were investigated in the mid-eastern continental margin of the Korean peninsula. The surveyed area resides on a gentle (less than 2 degree) continental slope running down to a submarine plateau in the northwestern part of the Ulleung Basin. The Ulleung Basin is a back-arc basin which was opened during the Tertiary Period behind the Japanese ... More
Presented by Dr. Seong-Pil KIM on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
The upper shelf of the landslide-prone Ligurian Margin (Western Mediterranean Sea) off Nice well-known for the 1979 Airport Landslide is a natural laboratory to study preconditioning factors and trigger mechanisms for submarine landslides. For this study low-stress ring shear experiments have been carried out on a variety of sediments from >50 gravity cores to characterise the velocity-dependent f ... More
Presented by Sylvia STEGMANN
Type: Oral presentation, full-paper Session: 05: Fjords & High Latitudes
Track: Oral presentations
An active fjord head delta in Squamish British Columbia, was selected as the location for a repetitive multibeam survey program to monitor temporal evolution of the prodelta morphology. Daily resurveys in 2011 established the style and extent of submarine mass movements, their typical periodicity and the conditions associated with the most active periods. This has now been followed by an hourly re ... More
Presented by Dr. John HUGHES CLARKE on 24 Sep 2013 at 09:00
Type: Poster presentation Session: Poster session
Significant seabed relief can develop along the upper surface of mass transport deposits (MTDs). However, the style of accommodation associated with MTD-related seabed relief and the way in which it influences the evolution and distribution of subsequent gravity-driven (e.g. turbidites) and current-controlled (e.g. contourites) deposits is relatively unknown and scarcely documented. This work seek ... More
Presented by Dr. Lorena MOSCARDELLI on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 04: (In)stability of Volcanic Edifices
Track: Oral presentations
We review different types of mass transfer (landslides, debris avalanches, debris flows, turbidites) generated throughout the evolution of a long-lived volcanic island (Gran Canaria) from its emergence ca. 16 m.y. ago to the present. The choice of Gran Canaria is based on its unique characteristics in that the various types of downslope mass transfer are not only documented by acoustic methods and ... More
Presented by Hans-Ulrich SCHMINCKE on 23 Sep 2013 at 15:45
Type: Oral presentation, full-paper Session: 01: The Italian experience
Track: Oral presentations
The Holocene Twin Slides form the most recent of recurrent mass wasting events along the NE portion of Gela Basin within the Sicily Channel, central Mediterranean Sea. Here, we present new evidence on the morphological evolution and stratigraphic context of this coeval slide complex based on deep-drilled sediment sequences providing a >100 ka paleo-oceanographic record. Both Northern (NTS) and Sou ... More
Presented by Mr. Jannis KUHLMANN on 23 Sep 2013 at 11:30
Type: Poster presentation Session: Poster session
Track: Poster presentations
Large landslides (>1 km3) are a globally observed sediment facies- found on active and passive open continental slopes as well as at both high and low latitudes. They represent a significant geohazard due to their potential to create devastating tsunamis and destroy seabed infrastructures. A number of hypotheses for the causes of these landslides have been brought forward, which may be divided int ... More
Presented by Ms. Franziska Anna PALM on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Earthquakes trigger landslides, if there are accumulations of instable slope sediments and the slope is sufficiently steep. It is a simple as that. Is it? Obviously it is not.... On 27 February 2010, the Central Chilean Maule Region was ruptured by a megathrust earthquake of magnitude (Mw) 8.8. This 6th largest ever instrumentally recorded earthquake occurred after a phase of relative seismic qui ... More
Presented by Dr. David VöLKER on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
Carmacoring and D’Appolonia provide an innovative large diameter piston coring system for use in offshore geotechnical and geophysical surveys. The main advantages of the system are 1) easy installation and deployment from a wide range of vessels, 2) excellent recovery of high quality samples using an active piston, 3) variable barrel length (3 to 30 m) 4) no water depth limitations and 5) core ... More
Presented by Omar ZANOLI on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
In the 1990s several modest earthquakes generated surprisingly large tsunamis without any significant transoceanic tsunami. A number of studies investigated these local tsunami events and concluded that submarine landslides were to blame. It seems timely that Pacific Island Nations investigate the nature and location of submarine landslides and unstable slopes. The Pacific Island Countries (PICs) ... More
Presented by Dr. Susanne POHLER on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
Continental margins characterized by low seismic activity and low sedimentation rate like the continental slopes offshore East Australia are often not considered as being subject to significant submarine landsliding and related tsunami hazard. Recent observations of the R/V Southern Surveyor expeditions however call for a re-evaluation of the stability of the continental slopes off East Australia ... More
Presented by Dr. David VöLKER, Ms. Samantha CLARKE on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 06: Mediterranean, Marmara, Black Sea
Track: Oral presentations
The Sea of Marmara (SoM) is affected by large earthquakes occurring on the North Anatolian Fault. Numerous submarine mass movements have occurred and the most recent turbidites in the basins of the SoM have been related to historical earthquakes. Within the SoM, the occurrence of submarine mass movements and their size appears modulated by eustatic changes that can be accompanied by transitions be ... More
Presented by Dr. CELINE GRALL on 24 Sep 2013 at 12:00
Type: Poster presentation Session: Poster session
A submarine slope at the head part of the submarine valley in the South China Sea Liwan 3-1 gas field is taken as an example for the mass movement prediction of submarine landslide in this area. Firstly, the FEM strength reduction method is used for submarine slope stability analysis, and then the height and length of the potential submarine landslide can be obtained. The travel distance of the mo ... More
Presented by Dr. zongxiang XIU on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 01: The Italian experience
Track: Oral presentations
Seismic data and multi-beam bathymetry reveal the occurrence of several exposed or shallowly buried Mass Transport Complexes (MTCs) in the South-Western Adriatic margin (SWAM), which represents the outer sector of the Albanides-Dinarides foreland basin. MTCs are spatially diffused along the SWAM and characterized by high variability in size, morphology and internal geometry. MTCs are derived from ... More
Presented by Mr. Giacomo DALLA VALLE on 23 Sep 2013 at 10:45
Type: Oral presentation, full-paper Session: 07: Australia, Latin America
Track: Oral presentations
The passive continental margins of the Atlantic Ocean are characterized by thick sedimentary successions, which might become unstable resulting in landslides of various sizes. The type of mass-wasting differs between individual margin sections but the reasons for these differences are not well understood. The NW-African continental margin is characterized by several large-scale but infrequent land ... More
Presented by Prof. Sebastian KRASTEL on 24 Sep 2013 at 15:00
Type: Oral presentation, full-paper Session: 01: The Italian experience
Track: Oral presentations
High-resolution multibeam bathymetry acquired around Ventotene and S. Stefano islands (eastern Pontine Archipelago, Italy) enabled us to map main mass wasting features affecting their submarine portions. Large-scale instability morphological features are absent (apart from a 4x2.5 km caldera in the western sector), whereas 126 landslide scars of hundred-meter of length scale were identified betwee ... More
Presented by Dr. Daniele CASALBORE on 23 Sep 2013 at 10:15
Type: Poster presentation Session: Poster session
IODP Exp.344 (Costa Rica Seismogenesis Project: CRISP 2) is designed to understand the processes that control nucleation and seismic rupture of large earthquakes at erosional subduction zones and drilled five sites off the western coast of Costa Rica around the southern end of the Middle America Trench, where the oceanic Cocos Plate is subsiding beneath the Carrbbean Plate. Main objective of thi ... More
Presented by Ms. Hitomi UCHIMURA on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 09: Tsunami Models and Geotechnical Testing
The BIG’95 landslide was emplaced 11,500 years ago and is one of the largest known submarine landslides in the Mediterranean Sea. The simulated landslide dynamics matches the observed run-out and deposited thickness. Water elevation simulated by using a dispersive tsunami model exceed 10 m close to the landslide area and at the nearest shorelines. Modeling further indicates that the tsunami prob ... More
Presented by Dr. Carl Bonnevie HARBITZ on 25 Sep 2013 at 11:00
Type: Oral presentation, full-paper Session: 11: Indian Ocean and Asian Pacific
Track: Oral presentations
We model several scenarios of potential submarine landslide tsunamis in the Andaman Sea off the Thai west coast. Our results suggest that landslides may be capable of producing significant tsunamis. Two categories of submarine landslide scenarios were evaluated. Geometry parameters of the first category are taken from identified mass transport deposits (MTDs); the second category considers a poten ... More
Presented by Mrs. Julia SCHWAB on 25 Sep 2013 at 14:15
Type: Oral presentation, full-paper Session: 09: Tsunami Models and Geotechnical Testing
Track: Oral presentations
We study potential tsunami hazards associated with submarine landslides in Lake Ohrid, Macedonia/Albania. The transboundary Lake Ohrid located on the Balkan Peninsula shared by Macedonia and Albania is considered to be the oldest- continuously existing lake in Europe (2-5 Ma), though the age and the origin are not completely unraveled to date. Previous studies by means of hydroacoustic methods hav ... More
Presented by Dr. Katja LINDHORST on 25 Sep 2013 at 09:45
Type: Poster presentation Session: Poster session
The three uplifted atoll islands Banaba, Nauru and Niue are shaped by submarine mass wasting. For each island, the most distinct submarine landslide is described using multibeam bathymetry. All three islands are fractured through tectonic uplift. Subaerial exposure caused further structural weakness through karstification and dolomitisation, which increased porosity and permeability of the limesto ... More
Presented by Dr. Susanne POHLER on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 07: Australia, Latin America
Track: Oral presentations
Morphological analyses of ~14500 km2 of high-resolution-bathymetric data in the Caribbean continental margin of Colombia has allowed us to identify submarine landslides in the Sinú Accretionary Prism (SAP) and Magdalena submarine fan (MSF) areas. In the MSF area most of submarine failures are disintegrative, i.e. with no obvious deposit near or at the base of the scar, and are related to a syste ... More
Presented by Dr. Javier IDáRRAGA-GARCíA on 24 Sep 2013 at 15:45
Type: Oral presentation, full-paper Session: 07: Australia, Latin America
Track: Oral presentations
Morphologic characterisation of five distinct, eastern Australian upper continental slope submarine landslides enabled modelling of their tsunami hazard. Flow depth, run-up and inundation distance has been calculated for each of the five landslides. Future submarine landslides with similar characteristics to these could generate tsunami with maximum flow depths ranging five to ten meters at the co ... More
Presented by Ms. Samantha CLARKE on 24 Sep 2013 at 14:00
Type: Poster presentation Session: Poster session
Track: Poster presentations
In the past few years, a number of terrestrial and submarine surveys undertaken along the north shore of the St. Lawrence Estuary (eastern Canada) have led to a better understanding of underwater mass movements failure mechanisms, their terrestrial extent, their probability of occurrence and their chronology (e.g., Cauchon-Voyer et al., 2008, 2011, Locat et al., 2012). Here we present a compilatio ... More
Presented by Gabriel JOYAL on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 01: The Italian experience
Track: Oral presentations
New mapping techniques allow us to define with unpreceded detail seafloor morphology; scientific literature is flooded with a growing number of researches based on high-resolution bathymetry and/or morphometry depicting new geological features and processes. Such techniques however will give an important, up to essential, contribute to the management of the marine areas by national agencies and lo ... More
Presented by Prof. Francesco Latino CHIOCCI on 23 Sep 2013 at 09:30
Type: Oral presentation, full-paper Session: 08: Fossil Slide Complexes
Jurassic strata exposed in outcrops along road cuts and trails as well as saw cut wall sections of “technical marmor” quarries at Adnet close to Salzburg and Waidring were studied for their depositional features, their geometries of sediment bodies, syn-depositional deformation and re-deposition structures as well as tectonic features. A spectacular mass wasting complex at Rote Wand/ Mount Ste ... More
Presented by Prof. Rüdiger HENRICH on 24 Sep 2013 at 16:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
The 1964 Alaska Mw9.2 earthquake triggered numerous submarine slope failures in fjords of southern Alaska. These failures generated local tsunamis, such as at Whittier, where they inundated the town within 4 minutes of the beginning of shaking. Run-up was up to 32 m, with 13 casualties. We collected new multibeam bathymetry and high-resolution sparker seismic data in Passage Canal, and we examined ... More
Presented by Dr. Peter HAEUSSLER
Type: Oral presentation, full-paper Session: 04: (In)stability of Volcanic Edifices
Track: Oral presentations
Onshore-offshore geophysical studies conducted on Martinique have identified major flank collapse events of Montagne Pelée that generated large submarine mass wasting deposits. Here, we evaluate the preconditioning factors involved in the deformation and failure of marine sediments related to volcano-flank collapse events. We use core logging, sedimentological and geotechnical data of the upper 2 ... More
Presented by Mrs. Sara LAFUERZA on 23 Sep 2013 at 16:15
Type: Poster presentation Session: Poster session
Different styles of smaller-scale mass movements characterise the continental slope offshore Lofoten, northern Norway. We use a multi-disciplinary approach to evaluate their origin as well as the present-day stability of the area, by combining morphological, sedimentological, geotechnical and geophysical data, complemented with slope stability modelling. The mass movements occur in water depths be ... More
Presented by Mrs. Nicole Jeanne BAETEN on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
Many large submarine landslide complexes on passive margins are retrogressive in which the head scarp back-steps over time. What controls the timescale of retrogression and are present-day slide complexes along the world’s continental margins stable or progressively weakening? Retrogressive failure is a coupled process. When an initial slope failure occurs, sediments behind the headwall experie ... More
Presented by Prof. Derek SAWYER on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 03: Pore Fluids & Microfabrics
Track: Oral presentations
Pore pressure response during slope failure controls the nature of slope failure, its periodic behavior, and the form of the stratigraphic record. During liquefaction failure, large volumes of sediment associated with clay rich deposits undergo contraction and liquefication during shear failure. Episodic, retrogressive, failures are recorded in densified mass transport deposits that record separat ... More
Presented by Peter FLEMINGS on 23 Sep 2013 at 14:00
Type: Poster presentation Session: Poster session
Track: Poster presentations
Voluminous mass-transport deposits (MTD) have been identified on seismic profiles across the central Nile Deep-Sea Fan (NDSF). The youngest MTDs are buried under 30-100 m of well-stratified slope deposits that, in water depths of 1800-2600 m, are characterized by undulating reflectors correlated with slope-parallel seabed ridges and troughs. Seabed imagery shows that, in the western part of the ce ... More
Presented by Prof. Sébastien MIGEON on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Multibeam and seismic data reveal repeated slope failures at various scales along the western slope of Great Bahama Bank. In addition, creeping and incipient slump scars indicate slope instabilities that will lead to large-scale slope failures in the near future. To assess the potential of tsunami generation by these mass movements several tsunami scenarios have been constructed and simulated num ... More
Presented by Jara S. D. SCHNYDER on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
To investigate the post-failure dynamics of subaerial and subaqueous landslides in various environments, we need a detailed analysis of the geotechnical and rheological behaviour of fine-grained sediments. For fine-grained sediments found in the subaerial and subaqueous environments, rheological research should be conducted as a prelude to understanding flow behaviour and hazard assessment. In thi ... More
Presented by SuengWon JEONG
Type: Oral presentation, full-paper Session: 07: Australia, Latin America
Track: Oral presentations
The Yamba Slide Complex is located on eastern Australia's upper continental slope offshore from the town of Yamba in northern New South Wales. It is a composite submarine landslide feature in which near-surface, slab slides up to sixty meters thick have been detached and removed from the upper portion of a larger rotational slump block approximately 2 km wide, 4 km long and some hundreds of metre ... More
Presented by Dr. Thomas HUBBLE on 24 Sep 2013 at 13:30
Type: Poster presentation Session: Poster session
The Quaternary stratigraphic architecture of seamounts and surrounding deposits in the eastern Alboran Sea reveals at least 53 stacked MTDs in the Pollux Bank, Sabinar Bank (Sabinar Platform and Western Sabinar), Maimonides Ridge, and Adra Ridge. These MTDs are grouped into two types based on their size: small-scale MTDs (length < 5 km and thickness < 18 ms) and large-scale MTDs (length > 5 km and ... More
Presented by Prof. Belen ALONSO on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Time series bathymetric data acquired between 1991 and 2011 have been used to evaluate the recent morphological evolution of Nice upper continental slope (SE France, Ligurian Sea).This area is affected by a large number of submarine landslides. Frequency, size and impact of small size failure are not well-known and difficult to detect using classical tools.However it lead to regressive motion of c ... More
Presented by Ms. Maelle KELNER on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
In the past few years, large earthquakes and torrential rains triggered several large scale mass movement events offshore Southwestern Taiwan. They induced severe submarine hazards and caused series of submarine cable breakages. In this study, we use high-resolution bathymetry, chirp sonar, and seismic profile data together with core samples to investigate possible factors which may increase the v ... More
Presented by Dr. Ho-Han HSU on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
A large number of exposed scars, originated by multievent sediment failures, have been identified on the southern flank of a deep submarine valley in Salerno Bay (Southern Tyrrhenian Sea), between depths of 300 m and 700 m. A 200 km2 complex slide lies across a 17 km-long SW-NE trending anticline, which is exposed 40 m above the seafloor of the continental slope and folds a Pleistocene marine suc ... More
Presented by Ms. Francesca BUDILLON on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 06: Mediterranean, Marmara, Black Sea
Track: Oral presentations
Construction of submarine pipelines across the Caucasian shelf of the Black Sea draws a necessity of a detailed study of submarine landslides, which were discovered during a recent survey. The most probable triggers for landslide generation for the Caucasian shelf include earthquakes, wave loading and human activity. Slope stability assessment of the study area was carried out in order to reveal t ... More
Presented by Mr. Vsevolod IONOV on 24 Sep 2013 at 12:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
A series of large-scale, stacked and locally amalgamated mass transport complexes (MTC’s) have been identified using 2D seismic reflection lines in the deepwater area of the Taranaki Basin, offshore Western New Zealand. The MTC’s represent a significant proportion (c. 40 %) of the Plio-Pleistocene succession and cover a combined area in the excess of 40,000 km2, with individual examples showi ... More
Presented by Dr. Suzanne BULL on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 11: Indian Ocean and Asian Pacific
Track: Oral presentations
The Barren and the Western ridge, in a subduction related setting, forms a part of inner volcanic arc in the Andaman Sea. Barren Island is the sub-aerial expression of the Barren volcanic ridge. Bathymetric survey has delineated the submarine extension of Barren ridge as well as another 55 km long Para longitudinal submarine volcanic ridge, 16 to 18 km west of Barren Island. Both the ridges might ... More
Presented by Dr. Bijan Kumar SAHA on 25 Sep 2013 at 14:30
Type: Poster presentation Session: Poster session
Track: Oral presentations
Submarine landslides on continental slopes are triggered by diverse mechanisms such as sea-level variations, climate-driven sediment supply fluctuations, slope steepening related to long term tectonics, earthquakes and human activities. In the present work, we try to discriminate the origin of major gravity events recorded in three sediment cores collected on the Var Sedimentary Ridge (NW Mediterr ... More
Presented by Ms. Virginie HASSOUN on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 11: Indian Ocean and Asian Pacific
Track: Oral presentations
Large-scale mass-transport deposits (MTDs), here called the Huaguang MTDs, occur in the South China Sea region within the Qiongdongnan Basin, north of Guangle Uplift and west of Xisha Uplift. As a large-scale buried MTD system, the Guaguang MTDs cover an area of more than 18,000 km2 and can be divided into four distinct sub-MTDs. Sediment sources for MTD1, MTD2 and MTD3 are from southern Guangle U ... More
Presented by Dr. dawei WANG on 25 Sep 2013 at 16:00
Type: Poster presentation Session: Poster session
Track: Poster presentations
Lakes in perialpine realms, commonly, comprise high-resolution sedimentary archives, which record climatic, environmental, tectonic and anthropogenic changes and events. In this study, we focus on Lake Silvaplana, using 3.5 kHz single-channel pinger profiles and a 10.5 m long sediment core, in order to improve our knowledge on tectonic and sedimentologic processes and their interactions. Lake Silv ... More
Presented by Benjamin BELLWALD on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
By a high-resolution 3D seismic data analysis, a great number of buried submarine landslide deposits were identified off Shimokita Peninsula, NE Japan. The submarine landslide deposits are interpreted as slump deposits interbedded in the Pliocene and Quaternary formations in northern Sanrikuoki Basin. Some of the slump deposits are over size of the survey area and are likely more than 30 km in bot ... More
Presented by Dr. Sumito MORITA on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 07: Australia, Latin America
Track: Oral presentations
We use complete inventories of submarine landslides from the Middle America (MA) and the Central Chile (CC) trench and forearc systems to analyze the size-frequency relationship of such structures on active continental slopes. The MA forearc is characterized by subduction erosion, and the CC forearc has had an accretionary tectonic history since the Late Neogene. Both are end-member types of conve ... More
Presented by Prof. Jan BEHRMANN on 24 Sep 2013 at 14:45
Type: Poster presentation Session: Poster session
Track: Poster presentations
The submerged carbonate platform north of Puerto Rico terminates in a high (3000-4000 m) and in places steep (> 45o) slope characterized by numerous landslide scarps including two 30-50 km-wide amphitheater-shaped features. The origin of the steep platform edge and the amphitheaters has been attributed to: 1) catastrophic failure, or 2) localized failures and progressive erosion. Determining which ... More
Presented by Prof. Jason CHAYTOR
Type: Oral presentation, full-paper Session: 05: Fjords & High Latitudes
Track: Oral presentations
Climate variations control sediment supply to the continental slope as well as glacial advances and retreats, which (a) cause significant stress changes in the sedimentary column and redistribution of interstitial fluids, (b) induce a particular margin stratigraphic pattern and permeability architecture and (c) are at the origin of isostatic adjustments that may reactivate faults. We test this hyp ... More
Presented by Mr. Jaume LLOPART on 24 Sep 2013 at 10:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
Several relatively small and spatially-isolated landslides with low mobility characterise the geomorphology of the upper continental slope off the Vesterålen islands. Here, we present results from a multidisciplinary study that integrates swath bathymetry data, high-resolution seismic reflection profiles and a multitude of geological and geotechnical laboratory tests from a 12 m long piston core ... More
Presented by Dr. Jean-Sebastien L'HEUREUX on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
 Submarine landslides have been observed even on very low-angle slope well below the angle of response, and are often greater in size and in migration distance than landslides on land. A number of large-scale submarine landslide (slump) deposits were identified in Pliocene and upper formations by analyzing METI’s 3D seismic data “Sanrikuoki 3D” obtained off Shimokita Peninsula (Morita et a ... More
Presented by Mr. Yuki NAKAMURA on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
Methane hydrate (white gold) is a crystal fuel which releases 164 unit volume of methane gas from one unit volume of gashydrate.Hydrate dissociation could be critical in inciting slope failures for low permeability sediments in shallower water depths. Since gas hydrates are located on the continental slope and – if present in sufficient amounts – may increase sediment strength, their dissocia ... More
Presented by Mr. SUNJAY SUNJAY on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
Subaquatic landslide deposits are important components of the sedimentary infill of lakes. Lakes offer the unique possibility to study subaqueous mass-wasting phenomena, similar to the processes in marine environments, under more accessible and spatially confined conditions. Lake sediments are highly sensitive archives of environmental changes and geological events, such as earthquakes. Previous s ... More
Presented by Anna REUSCH on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 06: Mediterranean, Marmara, Black Sea
Track: Oral presentations
Sediment starved passive margins, particularly those of insular slopes, display significant mass transport activity despite the absence of environmental stresses from high sedimentation rates. The “Menorca Channel” represents the up 90 to 120 m deep shelf sector connecting the Menorca and Mallorca Islands (Balearic Islands – Western Mediterranean). South of the Menorca Channel submarine grav ... More
Presented by Dr. Claudio LO IACONO on 24 Sep 2013 at 11:00
Type: Poster presentation Session: Poster session
Article 76 of the United Nations Convention on the Law of the Sea delineates a number of approaches that a nation may employ to determine its’ outer jurisdictional limits beyond 200 nautical miles. In these scenarios, the “foot of the continental slope” is a critical metric. Article 76 defines the “foot of the continental slope” rather vaguely: “In the absence of evidence to the contr ... More
Presented by Dr. David MOSHER on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
In the Lesser Antilles Volcanic Arc numerous sector collapse events have been identified in the last 30 years. So far 53 submarine deposits associated with sector collapse episodes have been identified off of the southern part of Montserrat and in the deep Grenada basin in the southern part of the arc. In both areas volumes of several tens of km3 have been identied. Some of these events were l ... More
Presented by Dr. Frederic DONDIN on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 09: Tsunami Models and Geotechnical Testing
Track: Oral presentations
Submarine landslides may occur along any passive or active continental margin and at different water depths. Most landslides that cause tsunamis result in more local effects than comparable earthquake-induced tsunamis, due to different source characteristics. However, enormous submarine landslides exhibiting volumes of several thousands of km3 may cause tsunamis with more widespread effects. Volca ... More
Presented by Dr. Carl Bonnevie HARBITZ on 25 Sep 2013 at 09:00
Type: Oral presentation, full-paper Session: 05: Fjords & High Latitudes
Track: Oral presentations
The Jan Mayen micro-continent is located in the Norwegian-Greenland Sea. It forms an up to 30 km wide and relatively flat-topped submarine ridge which narrows and deepens towards the south. The ridge rises 1500 – 2000 m above the surrounding sea-floor and has a length of some 150 km. Its northern termination is defined by the Jan Mayen Fracture Zone that is part of the mid-Atlantic spreading rid ... More
Presented by Dr. Jan Sverre LABERG on 24 Sep 2013 at 10:00
Type: Poster presentation Session: Poster session
Track: Poster presentations
Numerous shallow submarine slope failures (scars and deposits) are observed in recent high resolution bathymetric grids of the continental slope off the Israeli eastern Mediterranean coast. The nature of these slope failures is currently not comprehensively understood as well as the question of whether the eastern Mediterranean continental slope is continuously or episodically unstable. We report ... More
Presented by Dr. Oded KATZ on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 06: Mediterranean, Marmara, Black Sea
Track: Oral presentations
The Corsica Trough between the island of Corsica and the mainland of Italy is dominated on its western side by turbidite channel-lobe systems fed by high-gradient rivers during glacial epochs, while the eastern side is markedly different. It is flanked by the Pianosa Ridge, a prominent tectonic structure confining the distal reaches of turbidite lobes and it is characterized by the development of ... More
Presented by Dr. Antonio CATTANEO on 24 Sep 2013 at 11:45
Type: Poster presentation Session: Poster session
New multibeam bathymetric data from the southeastern Weddell Sea reveal three large-scale submarine slides on the upper slope of the Crary Fan, a trough mouth fan offshore from the glacially carved Filchner Trough. All slides head at the shelf edge (~500 m water depth), with the largest slide measuring 20 km wide and with an incision depth of 60 m. Multibeam and seismic data show elongate slide bl ... More
Presented by Ms. Jenny GALES on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
The Hovgaard Ridge is located in the central Fram Strait between Greenland and Svalbard, approx. 80 km southwest of the Molloy Fracture Zone that separates the Molloy and Knipovich spreading ridges. It is approx. 110 km long, rises up to ~1800 m above the surrounding sea floor, and has a triangular shape narrowing from ~20 km in the SE to <4 km in the NW. The dip of its southern slope is ~10-40° ... More
Presented by Matthias FORWICK on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 05: Fjords & High Latitudes
Track: Oral presentations
High-resolution TOPAS seismic profiles, bathymetric records and gravity cores from Byfjorden, surrounding the city of Bergen on the west coast of Norway, have been analysed in order to identify mass failures and their trigger mechanisms during the last 15,000 years. The seismic profiles show that Byfjorden comprises four 20-50 m deep sediment basins. These basins are characterised by glacimarine a ... More
Presented by Dr. Berit Oline HJELSTUEN on 24 Sep 2013 at 09:30
Type: Oral presentation, full-paper Session: 01: The Italian experience
Track: Oral presentations
The Ionian margins of Calabria and Apulia (IMCA) have been affected by mass movements of varying style, scale and age. Here we present examples of seabed and subsurface features identified along more than 400km of the IMCA from multibeam seabed imagery and subbottom profiles acquired by OGS since 2005. Four different types of mass movement phenomena are recognized with expression at seabed and in ... More
Presented by Dr. Silvia CERAMICOLA on 23 Sep 2013 at 10:00
Type: Oral presentation, full-paper Session: 06: Mediterranean, Marmara, Black Sea
Track: Oral presentations
This study investigates slope stability for a relatively small scale (5.7 km2, 0.6 km3), 8 kyr old landslide named Northern Twin Slide (NTS) at the slope of the Gela Basin in the Sicily Channel (central Mediterranean). The NTS is characterized by two prominent failure scars, forming two morphological steps of 110 m and 70 m height. Geotechnical data from a drill core upslope the failure scar (GeoB ... More
Presented by Mr. Fei AI on 24 Sep 2013 at 11:30
Type: Oral presentation, full-paper Session: 05: Fjords & High Latitudes
Track: Oral presentations
The 1930 landslide and associated 15-m high tsunami along the shore of Orkdalsfjorden, mid Norway, killed one person and caused major damage to port facilities. The combination of witness testimony with swath bathymetry data, high resolution seismic reflection data and gravity cores show that the failure propagated rapidly (up to 25 m/s) and progressively over a clay layer in a retrogressive manne ... More
Presented by Dr. Jean-Sebastien L'HEUREUX on 24 Sep 2013 at 09:45
Session: 04: (In)stability of Volcanic Edifices
Track: Oral presentations
Recent marine oceanographic surveys using geophysical techniques have revealed a number of debris avalanche deposits (VDAs) on the external flanks of Antimilos, Santorini and Nisyros volcanoes in the South Aegean Sea. Swath bathymetry and side-scan sonar surveys led to the recognition of characteristic hummocky topography on all of these deposits. On seismic profiles the VDAs are identified by cha ... More
Presented by Dr. Paraskevi NOMIKOU on 23 Sep 2013 at 16:00
Type: Oral presentation, full-paper Session: 06: Mediterranean, Marmara, Black Sea
Track: Oral presentations
The Malta-Sicily Escarpment (MSE) is a steep carbonate escarpment that appears to have largely remained isolated from inputs of fluvial and littoral sediments since the Messinian Salinity Crisis. Mass movement activity has so far only been inferred from sediment cores at the base of the MSE. In this study we use geophysical and sedimentological data acquired from the upper MSE and outer Malta Plat ... More
Presented by Dr. Aaron MICALLEF on 24 Sep 2013 at 11:15
Type: Poster presentation Session: Poster session
Dozens of small canyons arrange closely in the modern shelf break in LW area, north of South China Sea (SCS). These canyons have been formed and eroded since the middle Miocene. The significant terrain feature of these canyons are asymmetry cross-sections in which eastern flanks are steeper than the west. Multibeam bathymetry data and sub-bottom profiles revealed large quantities of small recent l ... More
Presented by Dr. Xishuang LI on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
One of the key challenges in submarine landslide research is to understand and quantify the role of different preconditioning factors that affect subaquatic slope stability. Excess pore pressure in a sedimentary sequence reduces effective stress and lowers the factor of safety. In-situ measurements and observations of fluid escape features at the sea floor commonly provide evidence for such overpr ... More
Presented by Dr. Jasper MOERNAUT on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 09: Tsunami Models and Geotechnical Testing
Track: Oral presentations
We present a short review of the state-of-the-art numerical tools that have been used for modeling landslide-generated waves. A comparative study is conducted on the physical properties of earthquake- and landslide-generated waves suggesting that both dispersion and nonlinearity effects may be neglected for the former waves whereas they may be considered for the latter ones. We introduce landslide ... More
Presented by Dr. Mohammad HEIDARZADEH on 25 Sep 2013 at 09:30
Type: Oral presentation, full-paper Session: 07: Australia, Latin America
Track: Oral presentations
High-resolution bathymetric maps from offshore SE Australia have shown that the continental margin is characterised by numerous landslides of all sizes and shapes. We have studied two of the larger slides, Shovel Slide and Bulli Slide, located in the upper to mid continental margin offshore New South Wales (NSW), in detail. Morphometric analyses suggest that the slides had the potential to creat ... More
Presented by Dr. Asrar TALUKDER on 24 Sep 2013 at 14:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
Volcanic flank-collapses usually produce voluminous debris avalanches, potentially destructive on land and tsunamigenic as well when they enter the sea. The expedition IODP 340 from 3rd March to 17th April 2012, offshore the Lesser Antilles arc volcanoes, yielded a unique record of the eruptive activity of the most active complexes over the last million years. The first observations of drilled cor ... More
Presented by Ms. Morgane BRUNET on 23 Sep 2013 at 17:15
Type: Poster presentation Session: Poster session
Track: Poster presentations
Sediment composition and biostratigraphic age data are reported for nine dredge samples collected from submarine scarps located on the middle continental slope portion of the eastern Australian continental margin. These data are used to confirm the depositional origins of these materials and constrain the timing of the onset of submarine erosion and canyon incision. Sediments dredged from cany ... More
Presented by Ms. Phyllis YU on 23 Sep 2013 at 17:15
Type: Oral presentation, full-paper Session: 09: Tsunami Models and Geotechnical Testing
Track: Oral presentations
Pore pressure and shear strength are two important parameters that control the stability of slopes. These parameters can be derived in-situ by cone penetration testing (CPT) with pore pressure measurements. This paper presents the results from three static, vibratory and dissipation CPT profiles deployed into a landslide headwall at Pyes Pa, Bay of Plenty, New Zealand. The landslide strata consist ... More
Presented by Mr. Mohammed Ehsan JORAT on 25 Sep 2013 at 11:15
Type: Oral presentation, full-paper Session: 02: Pore Fluids & Weak Layers
Track: Oral presentations
Weak layers play a major role in the development of many large submarine landslides. A definition of a weak layer is proposed here using a geotechnical perspective: a layer (or band) consisting of sediment or rock that has strength potentially or actually sufficiently lower than that of adjacent units (strength contrast) to provide a potential focus for the development of a surface of rupture. Su ... More
Presented by Prof. Jacques LOCAT on 23 Sep 2013 at 12:00
Type: Poster presentation Session: Poster session
Track: Poster presentations
The Soufrière Hills volcano on Montserrat has become one of the closest monitored island arc volcanoes since the onset of the ongoing (1995 - present) eruptive phase, which is characterized by the growth and collapse of andesite lava domes resulting in voluminous pyroclastic flows. In 2010 we acquired the first three-dimensional (3D) seismic dataset covering the submarine deposits of these recent ... More
Presented by Mr. Jens KARSTENS on 23 Sep 2013 at 17:15