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Precise source modeling of the 2005 Qeshm Island earthquake (Iran) using a joint inversion of surface deformation and aftershock data

Manoochehr Shirzaei(1), Mahdi Motagh(1), Thomas R. Walter(1), Abbas Golamzadeh(2) and Farzam Yaminifard(2)

(1) GeoForschungsZentrum (GFZ), VolcanoTectonics Junior Research Group, 14473 Potsdam, Germany
(2) International Institute of Earthquake Engineering, No. 26, Arghavan St., North Dibajee, Farmanieh, Tehran, Iran

Abstract

On November 27, 2005, a Mw 5.9 earthquake occurred in Qeshm Island in the Zagros Simply Fold Belt in eastern Persian Gulf. In this work we reevaluate source parameters of this earthquake using an integration of InSAR and aftershock data. The InSAR data set includes 10 interferograms obtained by Envisat images in ascending (I2 and I6 modes) and descending (I2 mode) orbits. The aftershocks were recorded by a temporary network of the International Institute of Earthquake Engineering and Seismology (IIEES) from 7 to 90 days after the main shock. For the inversion of InSAR data we use the Constrained Genetic Algorithm. We show that a single fault model that is obtained by the inversion of only InSAR data does not match with the pattern of the aftershock zone. Moreover, fault models in the InSAR-only inversion predict a shallow depth for the earthquake which is not consistent with the lithospheric structure of the Zagros belt and depth of aftershocks. In this paper we test various scenarios to resolve the discrepancy between the rupture zone outlined by aftershocks of the Qeshm earthquake and source parameters determined from the inversion of InSAR observations.

 

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry