1. Bathymetry, Gulf of Corinth

The Greek Supersite extends both onshore and offshore, from the Ionian Sea in the West across Central Greece to the Saronic Gulf, Aegean Sea in the East. It encompasses two of the most active structures of Europe in terms of seismicity and seismic hazard: the SSW-NNE striking, dextral Kephallinia Transform Fault along the western margin of the Ionian Islands and the extensional Gulf of Corinth rift.

The Digital Terrain Model of the seafloor of the Greek Supersite with a grid resolution of 1/16 x 1/16 arc minutes (circa 115 x 115 meters) has been produced by HCMR in the framework of EMODnet Bathymetry project (emodnet.eu/bathymetry). The DTM provides a detailed view of the morphological configuration of the seabed with implications for the underlying geological processes that have shaped the seafloor.

The roughly 900 m deep, flat seabed of the central Gulf of Corinth is bordered to the South and North by steep, faulted slopes that are incised by numerous gullies. Small and larger failures have occurred along both slopes leading to mass transport deposits and turbidites that form the bulk of the basin infill. Historical and recent tsunamis are associated with mass failures along the steep slopes.

Further west, the Inner Ionian Sea consists of a shallow shelf that is separated from the Ionian Islands by a N-S running 300-400 m deep, fault controlled valley. In the Ionian Sea, the most striking morphological feature is the SSW-NNE striking, 1000-3000 m high scarp along the trace of the Kephallinia Fault. Maximum depth of 3500 m occurs at short distance from SW Kephallinia Island.

The DTM of the seafloor will be updated with any new data that will become available in the future.