000007623 001__ 7623
000007623 005__ 20250820112409.0
000007623 037__ $$aPOSTER-2025-0045
000007623 100__ $$aGarcia-Fernandez, Mariano
000007623 245__ $$aRevealing 3d Subsurface Structure of Paliki Peninsula, Kefalonia, Greece
000007623 260__ $$c2025
000007623 269__ $$c2025-04-14
000007623 520__ $$aPaliki Peninsula, the western end of Kefalonia Island, has been repeatedly hit by moderate to large earthquakes and is located in one of the most active seismotectonic regions of the Mediterranean Sea, to the east of the major Kefalonia-Lefkada transform fault. In 1953, an Mw 7.0 earthquake, preceded by two Mw 5.9 and Mw 6.6 foreshocks, produced extensive damage in Kefalonia. More recently, in 2014, a sequence with two main shocks (~ Mw 6.0) within eight days caused considerable damage and ground failure in the Paliki Peninsula. To develop a new 3D subsurface model for understanding site effects and to compute a more detailed velocity model for accurately locating earthquakes, a joint geophysical field campaign was organized in September 2024. During this campaign, we installed eight cross-profiles and one array through the Paliki Peninsula, using 24 SmartSolo IGU-16HR 3C nodes, three SmartSolo IGU-BD3C-5LC broadband devices and two Tromino instruments. Ambient noise measurements were carried out at 220 locations, resulting in 3225 hours of recorded ambient noise data, including recordings of tens of small earthquakes. Array- and cross-correlation techniques, and Horizontal to Vertical Spectral Ratios (HVSR) were applied to model the shallow sedimentary cover and variation in bedrock depth, for better understanding the impact of earthquakes on this area. Preliminary results show increasing thickness of Miocene marls deposits from west to east, overlaying a bedrock of Eocene limestones deeping towards the eastern shoreline of the peninsula, with a steeper attitude in the north. To our knowledge, this is the first time that such large-scale fieldwork has been performed on the Ionian Islands and the recorded data will stimulate new research studies, contributing significantly to more precise earthquake locations, and more accurate local hazard assessments and risks evaluations.
000007623 594__ $$aNO
000007623 6531_ $$aHVSR
000007623 6531_ $$aKefalonia
000007623 6531_ $$aGreece
000007623 6531_ $$aSite effects
000007623 700__ $$aVan Noten, Koen
000007623 700__ $$aJimenez, Maria-Jose
000007623 700__ $$aSakellariou, Nikolaos
000007623 700__ $$aDe Plaen, Raphael
000007623 700__ $$aKouskouna, Vasiliki
000007623 700__ $$aLecocq, Thomas
000007623 700__ $$aRodriguez-Diaz, Sara
000007623 700__ $$aGalanos, Nikolaos
000007623 773__ $$tSSA2025, Denver, USA.
000007623 8560_ $$fkoen.vannoten@ksb-orb.be
000007623 980__ $$aCPOSTER