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Midcrustal Thrusting and Vertical Deformation Partitioning Constraint by 2017 Mw 7.3 Sarpol Zahab Earthquake in Zagros Mountain Belt, Iran

2018; Seismological Society of America; Volume: 89; Issue: 6 Linguagem: Inglês

10.1785/0220180022

1938-2057

Yinghui Yang, Jyr‐Ching Hu, Ali Yassaghi, Min‐Chien Tsai, Mehdi Zaré, Qiang Chen, Ze‐Gen Wang, Ali M. Rajabi, Farnaz Kamranzad,

Geological and Geochemical Analysis

Research Article| October 10, 2018 Midcrustal Thrusting and Vertical Deformation Partitioning Constraint by 2017 Mw 7.3 Sarpol Zahab Earthquake in Zagros Mountain Belt, Iran Ying‐Hui Yang; Ying‐Hui Yang aDepartment of Remote Sensing and Surveying Engineering, Southwest Petroleum University, No. 8, Xindu Road, Chengdu 610500, Sichuan, China, xzhfhyyy@126.comzegen01@126.comhAlso at Department of Geosciences, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan, Republic of China. Search for other works by this author on: GSW Google Scholar Jyr‐Ching Hu; Jyr‐Ching Hu bDepartment of Geosciences, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan, Republic of China, jchu@ntu.edu.tw Search for other works by this author on: GSW Google Scholar Ali Yassaghi; Ali Yassaghi cDepartment of Geology, Tarbiat Modares University, 14117‐13116 Tehran, Iran, Yassaghi@modares.ac.ir Search for other works by this author on: GSW Google Scholar Min‐Chien Tsai; Min‐Chien Tsai dSeismological Center, Central Weather Bureau, No. 64, Gongyuan Road, Taipei 10048, Taiwan, Republic of China, minchyen@cwb.gov.tw Search for other works by this author on: GSW Google Scholar Mehdi Zare; Mehdi Zare eDepartment of Mining Engineering, University of Tehran, 1417466191 Tehran, Iran, mzare@iiees.ac.irf_kamranzad@ut.ac.ir Search for other works by this author on: GSW Google Scholar Qiang Chen; Qiang Chen fDepartment of Remote Sensing and Geoinformation Engineering, Southwest Jiaotong University, No. 111, North 1st Section, 2nd Ring Road, Chengdu 610031, Sichuan, China, swjtucq@sina.com Search for other works by this author on: GSW Google Scholar Ze‐Gen Wang; Ze‐Gen Wang aDepartment of Remote Sensing and Surveying Engineering, Southwest Petroleum University, No. 8, Xindu Road, Chengdu 610500, Sichuan, China, xzhfhyyy@126.comzegen01@126.com Search for other works by this author on: GSW Google Scholar Ali M. Rajabi; Ali M. Rajabi gEngineering Geology Department, School of Geology, College of Science, University of Tehran, No.16, Azar Street, Enghelab Square, 1417614411 Tehran, Iran, amrajabi@ut.ac.ir Search for other works by this author on: GSW Google Scholar Farnaz Kamranzad Farnaz Kamranzad eDepartment of Mining Engineering, University of Tehran, 1417466191 Tehran, Iran, mzare@iiees.ac.irf_kamranzad@ut.ac.iriAlso at Swiss Seismological Service, ETH Zürich, CH‐8092 Zürich, Switzerland; farnaz.kamranzad@sed.ethz.ch. Search for other works by this author on: GSW Google Scholar Seismological Research Letters (2018) 89 (6): 2204–2213. https://doi.org/10.1785/0220180022 Article history first online: 10 Oct 2018 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Ying‐Hui Yang, Jyr‐Ching Hu, Ali Yassaghi, Min‐Chien Tsai, Mehdi Zare, Qiang Chen, Ze‐Gen Wang, Ali M. Rajabi, Farnaz Kamranzad; Midcrustal Thrusting and Vertical Deformation Partitioning Constraint by 2017 Mw 7.3 Sarpol Zahab Earthquake in Zagros Mountain Belt, Iran. Seismological Research Letters 2018;; 89 (6): 2204–2213. doi: https://doi.org/10.1785/0220180022 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietySeismological Research Letters Search Advanced Search ABSTRACT We investigate the geodetic data set of Interferometric Synthetic Aperture Radar (InSAR) including Advanced Land Observation Satellite (ALOS)‐2 and Sentinel‐1A/1B satellites for inferring the fault model of the 2017 Mw 7.3 Sarpol Zahab, Iran, earthquake. The InSAR deformation fields show that the seismogenic fault does not reach the ground surface, but some shallow folds have been triggered by the mainshock. Our preferred faulting model suggests that the coseismic rupture occurs on a single planar fault surface with a strike angle of 337.5°. Two significant slip sources are determined by the geodetic data: one is located within the 11.8‐ to 13.5‐km depth range with a peak slip of 4.9 m, and the other occurs at the shallower depth (10.5–12.5 km) with a peak slip of 4.5 m. Both of them are responsible for the primary deformation signals in the geodetic imagery. The significant fault slip concentrates at the 10‐ to 14‐km depth within the Pan‐African basement. However, most of the aftershocks have depths between 3 and 12 km in the shallow sedimentary section. We hypothesize that the Hormuz Salt section with a depth of 12–13 km detaches the high‐slip zones from the aftershock cluster, by which the fault slip is not transferred through the intervening salt section to the surface. The predicted static Coulomb stress change by our preferred faulting model at a depth of 10 km could encourage the occurrence of aftershocks. Moreover, the triggered fault‐related folding in the southwest of the seismic zone has a positive Coulomb stress change and aseismic slip caused by the mainshock. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.