Displacement analysis of the October 30, 2020 (Mw = 6.9), Samos (Aegean Sea) earthquake


Çırmık A., Pamukçu O., Doğru F., Cingöz A., Sözbilir H.

Journal of Geodetic Science, vol.14, 2024 (ESCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 14
  • Publication Date: 2024
  • Doi Number: 10.1515/jogs-2022-0166
  • Journal Name: Journal of Geodetic Science
  • Journal Indexes: Emerging Sources Citation Index (ESCI), Scopus
  • Ataturk University Affiliated: Yes

Abstract

Destructive earthquakes with high deformations have occurred in the Aegean region since the historical period. The most destructive of these earthquakes in recent years is the October 30, 2020 (M-w = 6.9) Samos (Aegean Sea) earthquake. This earthquake affected a wide area and caused numerous losses of lives and property especially in Izmir city. For examining the effects of the earthquake, Global Navigation Satellite System (GNSS) data before, during, and after the earthquake were processed, and coseismic and postseismic displacement evaluations were made. Interferometric Synthetic Aperture Radar (InSAR) ascending, descending interferograms, line of sight velocity, and displacement maps were obtained for the earthquake-affected area. The GNSS and InSAR data were evaluated together, and the areas with subsidence and uplift were determined in conjunction with the fault zone. In addition, the horizontal displacements were analyzed by using Coulomb failure criteria, and peak ground displacements were obtained from the strong motion stations located in the study region. As a result, from all the displacement analyses, it was determined that high-amplitude energy was released, at the regional scale from Ayvalik in the North to Datca in the South after the earthquake, and this earthquake generated permanent deformation in the affected region.