Seismic Activity of the Manisa Fault Zone in Western Turkey Constrained by Cosmogenic Cl-36 Dating

Mozafari N., ÖZKAYMAK Ç., Tikhomirov D., Ivy-Ochs S., Alfimov V., SÖZBİLİR H., ...More

GEOSCIENCES, vol.11, no.11, 2021 (ESCI, Scopus) identifier

  • Publication Type: Article / Article
  • Volume: 11 Issue: 11
  • Publication Date: 2021
  • Doi Number: 10.3390/geosciences11110451
  • Journal Name: GEOSCIENCES
  • Journal Indexes: Emerging Sources Citation Index (ESCI), Scopus, Academic Search Premier, Directory of Open Access Journals
  • Keywords: active tectonics, fault scarp dating, cosmogenic Cl-36, Gediz Graben, western Anatolia, earthquake, Holocene
  • Dokuz Eylül University Affiliated: Yes

Abstract

This study reports on the cosmogenic Cl-36 dating of two normal fault scarps in western Turkey, that of the Manastir and Mugirtepe faults, beyond existing historical records. These faults are elements of the western Manisa Fault Zone (MFZ) in the seismically active Gediz Graben. Our modeling revealed that the Manastir fault underwent at least two surface ruptures at 3.5 & PLUSMN; 0.9 ka and 2.0 & PLUSMN; 0.5 ka, with vertical displacements of 3.3 & PLUSMN; 0.5 m and 3.6 & PLUSMN; 0.5 m, respectively. An event at 6.5 & PLUSMN; 1.6 ka with a vertical displacement of 2.7 & PLUSMN; 0.4 m was reconstructed on the Mugirtepe fault. We attribute these earthquakes to the recurring MFZ ruptures, when also the investigated faults slipped. We calculated average slip rates of 1.9 and 0.3 mm yr(-1) for the Manastir and Mugirtepe faults, respectively.