Modification of the Shape of Pacific Islands by Submarine Landslides: Banaba, Nauru, and Niue
Presented by Dr. Susanne POHLER on 23 Sep 2013 from 17:15 to 19:15
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 limestone cap. Initial fractures became enlarged into chasms, caves and caverns which ultimately resulted in flank failure. The ages of these submarine landslides are poorly constrained, but were probably youngest for Home Bay, Banaba, (>10,000 BP); between 1.6 Ma and 10,000 BP for Anabar Bay, Nauru; and 700,000 BP or less for Tepa Point, Niue.