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Vol. 61, n.4, December 2020
pp. 469-486

Joint inversion approach to estimate earthquake source parameters using InSAR observations and strong ground motion data (2008 Qeshm earthquake in Iran)

Z. Golshadi, M.S. Pakdaman and M. Rezapour

Received: 9 October 2018; accepted: 31 December 2019

Abstract

We define the geometric and kinematic characteristics of the fault activated during the 10 September 2008 Qeshm earthquake, from the joint inversion of three InSAR observation sets (L-band, C-band, and X-band) and permanent displacement obtained from strong ground motion data. Our best-fit solution for the mainshock is represented by a reverse fault with a left-lateral component, dipping 54ºSE with a maximum slip of ~200 cm at the centre of fault. The more realistic surface movements in three directions are extracted from the modelled displacements too. The fault investigated in this study affected the sedimentary cover approximately at a depth of Hormoz salt while it does not reach the basement and surface. The Hormoz salt and Gurpi formations have a vital role as a barrier against slip. Coulomb stress changes suggest that this faulting originates the vertical growth of the Laft anticline with no effect on the Ramkan syncline. Our findings show a significant relationship between this earthquake and the annual continental convergence in NE direction.

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