23-25 September 2013
GEOMAR East shore
Europe/Berlin timezone
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Modeling submarine landslide-generated waves in Lake Ohrid, Macedonia/Albania

Presented by Dr. Katja LINDHORST on 25 Sep 2013 from 09:45 to 10:00
Type: Oral presentation, full-paper
Track: Oral presentations

Content

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 have shown that the western margin of Lake Ohrid has a long history of mass wasting. Based on seismic data, slide deposits are found in different stratigraphic levels as well as on the lake floor where they have affected a large area. This study is focused on the well-studied Udenisht Slide Complex covering an area of 27 km² within the southwestern part of Lake Ohrid.The Udenisht slide is by far the largest mass movement with an average thickness of 30 to 40 m and an estimated volume of about 0.11 km³. It is therefore well within the limits of submarine landslides that are known to be capable of triggering tsunamis. Using numerical modeling, the propagation of a landslide-generated tsunami with an initial wave height of more than 5 m has been calculated. Run-up heights estimated for coastal communities around the lake are moderate in the north (2-3m) can reach up to 10 m directly at the site where the slide initiated. This study is a first generation of landslide tsunami hazard assessment for Lake Ohrid and further detailed modeling is recommended for the region.

Place

Location: GEOMAR East shore
Address: Wischhofstr. 1-3 / D-24148 Kiel
Room: Lecture Hall Geb. 8A

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