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The 2017 Mw 7.3 Sarpol Zahāb Earthquake, Iran: A compact blind shallow-dipping thrust event in the mountain front fault basement

Chen, Kejie and Xu, Wenbin and Mai, P. Martin and Gao, Hua and Zhang, Lei and Ding, Xiaoli (2018) The 2017 Mw 7.3 Sarpol Zahāb Earthquake, Iran: A compact blind shallow-dipping thrust event in the mountain front fault basement. Tectonophysics, 747-748 . pp. 108-114. ISSN 0040-1951. http://resolver.caltech.edu/CaltechAUTHORS:20181004-091624984

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Abstract

The 12 November 2017 Mw 7.3 Sarpol Zahāb earthquake is one of the largest events to have occurred in the north-western Zagros fold-and-thrust belt during the instrumental period. We use teleseismic and synthetic aperture radar data to study the earthquake source parameters, rupture process and active tectonic characteristics of the event. We find that both data sets individually produce remarkably similar slip distribution, indicative of buried faulting that is consistent with the lack of significant surface rupture. Through the joint inversion of satellite radar and teleseismic data, we find that the rupture propagated rapidly (~3.2 km/s) and asymmetrically along strike to the south, but relatively slowly (~1.5 km/s) in the updip direction, and formed a single large-slip asperity with a peak slip value close to 5 m. Given the regional tectonic context of the distribution of known faults and lithologies, we suggest that the maximum slip is either located in the lowest sedimentary cover or the uppermost basement of the Mountain Front Fault.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.tecto.2018.09.015DOIArticle
ORCID:
AuthorORCID
Xu, Wenbin0000-0001-7294-8229
Additional Information:© 2018 Elsevier. Received 19 June 2018, Revised 26 September 2018, Accepted 29 September 2018, Available online 4 October 2018. The authors thank editor Kelin Wang and two anonymous reviewers for comments that greatly improved this manuscript. The seismic data were processed using the SAC software packages. The ALOS-2 data were provided by JAXA (http://en.alospasco.com) under a contract of the 6th Research Announcement for ALOS-2 (No. P1246, P3381) and the Sentinel-1A data by ESA/Copernicus (https://scihub.copernicus.eu). Several figures were prepared by using the Generic Mapping Tools software. The modified Mudpy software was used for slip inversion. W. X. was supported by the Hong Kong Research Grants Council Early Career Scheme Fund (F-PP4B). P.M.M is funded by King Abdullah University of Science and Technology (KAUST) in Thuwal, Saudi Arabia, grants BAS/1339-01-01.
Funders:
Funding AgencyGrant Number
Research Grants Council of Hong KongF-PP4B
King Abdullah University of Science and Technology (KAUST)BAS/1339-01-01
Subject Keywords:Zagros; Joint inversion; Mountain Front Fault; InSAR
Record Number:CaltechAUTHORS:20181004-091624984
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181004-091624984
Official Citation:Kejie Chen, Wenbin Xu, P. Martin Mai, Hua Gao, Lei Zhang, Xiaoli Ding, The 2017 Mw 7.3 Sarpol Zahāb Earthquake, Iran: A compact blind shallow-dipping thrust event in the mountain front fault basement, Tectonophysics, Volumes 747–748, 2018, Pages 108-114, ISSN 0040-1951, https://doi.org/10.1016/j.tecto.2018.09.015. (http://www.sciencedirect.com/science/article/pii/S0040195118303196)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90131
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:05 Oct 2018 17:51
Last Modified:10 Oct 2018 16:21

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