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Tectonic implications of the Mw 6.8, 30 October 2020 Kuşadası Gulf earthquake in the frame of active faults of Western Turkey

A Mw 6.8 earthquake struck Western Turkey and Eastern Greece that occurred on October 30, 2020 in Kuşadası Gulf. The earthquake epicentre is located north of Samos Island and the focal mechanism solution shows that a normal fault was reactivated. The main shock and aftershock analysis imply that the large earthquake occurred on a north dipping normal fault which might be the western continuation of the Efes Fault in Western Turkey. We propose that the western continuation of the Efes Fault steps over right somewhere in northeast of Samos Island and continues further west along the northwest margin of the island, in the form of a transfer fault between two segments. | Turkish Journal of Earth Sciences Turkish J Earth Sci 2021 30 436-448 http journals.tubitak.gov.tr earth TÜBİTAK Research Article doi 10.3906 yer-2011-6 Tectonic implications of the Mw 6.8 30 October 2020 Kuşadası Gulf earthquake in the frame of active faults of Western Turkey Erhan ALTUNEL1 Ali PINAR2 1 Depratment of Geological Engineering Faculty of Engineering and Architecture Eskişehir Osmangazi University Eskişehir Turkey 2 Kandilli Observatory and Earthquake Research Institute Boğaziçi University İstanbul Turkey Received 06.11.2020 Accepted Published Online 03.01.2021 Final Version 16.07.2021 Abstract A Mw 6.8 earthquake struck Western Turkey and Eastern Greece that occurred on October 30 2020 in Kuşadası Gulf. The earthquake epicentre is located north of Samos Island and the focal mechanism solution shows that a normal fault was reactivated. The main shock and aftershock analysis imply that the large earthquake occurred on a north dipping normal fault which might be the western continuation of the Efes Fault in Western Turkey. We propose that the western continuation of the Efes Fault steps over right somewhere in northeast of Samos Island and continues further west along the northwest margin of the island in the form of a transfer fault between two segments. The aftershock distribution shows that both the western segment and the transfer fault were reactivated during the 30 October 2020 earthquake. This fault geometry can be compared with the E-W trending Gediz Graben where the southern boundary fault steps over right around Turgutlu and continues further west in Manisa. The historical records show that the source region and its vicinity is susceptible to frequent large earthquakes taking place on normal and strike-slip faults. The stress tensor inversion of the focal mechanisms of 55 aftershocks covering the source area shows dominant normal faulting mechanism which suggests NNE-SSW extensional stress regime in the region. Key words Kuşadası Gulf 30 .