Multiple source analysis from InSAR data and new insights into fault activation and stress transfer: The 2005 Zarand, Iran, earthquake
عنوان دوره: نوزدهمین کنفرانس ژئوفیزیک ایران
کد مقاله : 1733-NIGS
نویسندگان
1موسسه ژئوفیزیک دانشگاه تهران
2rezapour@ut.ac.ir
3INGV/professor
4INGV/Professor
چکیده
We have reinterpreted the causative fault parameters of the 2005 Zarand earthquake in the light of a new imagery study using Interferometric Synthetic Aperture Radar (InSAR). By conducting a joint inversion of two InSAR datasets, we can characterize the rupture as it relates to complex local structures. At first, the mainshock ruptured a nearly pure thrust fault, dipping ~65° NNW in the basement below the southeastern area of Zarand. Two more fault segments were subsequently activated: an oblique-normal fault segment parallel to the first segment, dipping 61° to the south, and a normal-oblique fault segment at the eastern termination of the rupture zone. The first fault segment ruptured the surface, while slip along the other two segments was confined to the lower sedimentary strata. The stress changes induced by the main fault segment that affected the other two segments were also measured, and showed progressive failure along the fault segments.
کلیدواژه ها
Title
Multiple source analysis from InSAR data and new insights into fault activation and stress transfer: The 2005 Zarand, Iran, earthquake
Authors
Zeynab Golshadi, mahdi rezapour, Simone Atzori, Stefano Salvi
Abstract
We have reinterpreted the causative fault parameters of the 2005 Zarand earthquake in the light of a new imagery study using Interferometric Synthetic Aperture Radar (InSAR). By conducting a joint inversion of two InSAR datasets, we can characterize the rupture as it relates to complex local structures. At first, the mainshock ruptured a nearly pure thrust fault, dipping ~65° NNW in the basement below the southeastern area of Zarand. Two more fault segments were subsequently activated: an oblique-normal fault segment parallel to the first segment, dipping 61° to the south, and a normal-oblique fault segment at the eastern termination of the rupture zone. The first fault segment ruptured the surface, while slip along the other two segments was confined to the lower sedimentary strata. The stress changes induced by the main fault segment that affected the other two segments were also measured, and showed progressive failure along the fault segments.
Keywords
InSAR, Zarand earthquake, Multiple source, Stress transfer