GPS derived finite source mechanism of the 30 October 2020 Samos earthquake, Mw=6.9, in the Aegean extensional region

AKTUĞ B., TİRYAKİOĞLU İ., SÖZBİLİR H., ÖZENER H., ÖZKAYMAK Ç., YİĞİT C. Ö., ...More

TURKISH JOURNAL OF EARTH SCIENCES, vol.30, no.1, pp.718-737, 2021 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 1
  • Publication Date: 2021
  • Doi Number: 10.3906/yer-2101-18
  • Journal Name: TURKISH JOURNAL OF EARTH SCIENCES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Geobase, INSPEC, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.718-737
  • Keywords: Samos, Global Positioning System (GPS), coseismic, earthquake, slip, rupture process, BALIKESIR TRANSFER ZONE, ALPINE-HIMALAYAN BELT, WESTERN ANATOLIA, ACTIVE TECTONICS, SURROUNDING REGIONS, CRUSTAL DEFORMATION, MENDERES GRABEN, TUZLA FAULT, EVOLUTION, SEA
  • Ankara University Affiliated: Yes

Abstract

A submarine area close to the Turkish and Greek border between the cities of Samos-Greece and Seferihisar-Turkey has been shaked on October 30, 2020 by a Mw = 6.9 earthquake. In this study, the finite source mechanism of the Samos earthquake was investigated using geodetic methods and the coseismic behavior of the earthquake was modeled. The observed coseismic displacements at 62 sites were inverted for the fault geometry and the slips. The mainshock did not generate an on-land surface rupture. However, the uniform slip modeling shows a finite source of 43.1 km long and 16 km wide rupture, which slips 1.42 m along a north dipping normal fault extending from the Aegean Sea floor to a depth down to similar to 13 km. While the uniform slip model is consistent with the seismological solutions and provides a sufficient fit to the far field coseismic offsets, a distributed slip model is necessary to account for the near field coseismic displacements.