Dynamic models of earthquakes on the North Anatolian fault zone under the Sea of Marmara: Effect of hypocenter location

David D. Oglesby*, Paul Mai, Kuvvet Atakan, Stefano Pucci

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

We perform three-dimensional spontaneous dynamic rupture models of potential earthquakes on the geometrically complex North Anatolian fault zone (NAFZ) under the Marmara Sea, Turkey. The NAFZ south ofthe city of Istanbul consists of a large-scale extensional stepover, with right lateral strike-slip segments linked by an oblique normal segment. We find that earthquakes nucleating near the stepover do not propagate across the entire fault system due to the statically unfavorable stress field on the oblique fault, and lead to moderate-size events only. However, earthquakes initiating a significant distance from the stepover cause significant dynamic unclamping of the oblique fault, and thus generate large through-going raptures. Dynamic unclamping also produces supershear rupture propagation in the vicinity of fault discontinuities. The results emphasize that estimations of earthquake size, rupture propagation, and slip distribution cannot be decoupled from the location of the hypocenter and the orientation of the geometrically complex fault system within the tectonic stress field.

Original languageEnglish (US)
Article numberL18302
JournalGeophysical Research Letters
Volume35
Issue number18
DOIs
StatePublished - Sep 28 2008

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Geophysics

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