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Anatomy of October 30, 2020, Samos (Sisam) –Kuşadası earthquake (MW 6.92) and its influence on Aegean earthquake hazard

We investigated rupture geometry, size, and slip distribution of October 30, 2020, Samos (Sisam)–Kuşadası earthquake combining seismographs, GPS measurements, and SAR analysis. Right after the earthquake, we measured 13 additional campaignbased GPS sites to intensify the available GPS network consisting of 10 continuous stations. We combined all available seismographs to have the best possible accuracy for mainshock and aftershock hypocenter locations. We compiled all available seismic profiles and integrated them using high-resolution bathymetry to map seismically active faults. | Turkish Journal of Earth Sciences Turkish J Earth Sci 2021 30 425-435 http journals.tubitak.gov.tr earth TÜBİTAK Research Article doi 10.3906 yer-2102-18 Anatomy of October 30 2020 Samos Sisam Kuşadası earthquake MW 6.92 and its influence on Aegean earthquake hazard 1 1 2 3 4 Fatih BULUT Aslı DOĞRU Cenk YALTIRAK Sefa YALVAÇ Murat ELGE 1 Department of Geodesy Kandilli Observatory and Earthquake Research Institute Boğaziçi University İstanbul Turkey 2 Department of Geology Faculty of Mines İstanbul Technical University İstanbul Turkey 3 Department of Survey Engineering Faculty of Engineering Gümüşhane University Gümüşhane Turkey 4 Turkish Office of Navigation Hydrography and Oceanography İstanbul Turkey Received 24.02.2021 Accepted Published Online 17.04.2021 Final Version 16.07.2021 Abstract We investigated rupture geometry size and slip distribution of October 30 2020 Samos Sisam Kuşadası earthquake combining seismographs GPS measurements and SAR analysis. Right after the earthquake we measured 13 additional campaign- based GPS sites to intensify the available GPS network consisting of 10 continuous stations. We combined all available seismographs to have the best possible accuracy for mainshock and aftershock hypocenter locations. We compiled all available seismic profiles and integrated them using high-resolution bathymetry to map seismically active faults. The mainshock hypocenter is located at 37.913 0.009 N and 26.768 0.017 E and a depth of 12.3 1.7 km. Our fault plane solution shows that the mainshock has almost a pure normal-type mechanism. Based on accurate aftershock locations as well as InSAR results the mainshock rupture is subsegmented with two north-dipping rupture planes. The rupture probably starts on a low angle plane generating 1.1 m average slip between the depths of 9 14 km. It merges to a steep plane at 9 km depth where it generates 1.2 m average slip extending towards the surface near the shoreline of Samos Sisam Island. Total size of the two