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Coseismic deformation of the 2015 M (sub w) 6.4 Pishan, China, earthquake estimated from Sentinel-1A and ALOS2 data

Feng Guangcai, Li Zhiwei, Xu Bing, Shan Xinjian, Zhang Lei and Zhu Jianjun
Coseismic deformation of the 2015 M (sub w) 6.4 Pishan, China, earthquake estimated from Sentinel-1A and ALOS2 data
Seismological Research Letters (July 2016) 87 (4): 800-806

Abstract

The 2015 M (sub w) 6.4 Pishan earthquake is the largest to have occurred in the Tarim Basin since 1976. It caused great damage to infrastructures and private houses in the city of Pishan and surrounding areas. We use ascending and descending interferometric Sentinel-1A (S1A) and Advanced Land Observation Satellite 2 data to constrain the source parameters of this earthquake. The coseismic fault-slip model obtained from a joint inversion indicates that the rupture is dominated by a thrust motion with a 7 km buried depth. The fault slip is centralized on a roughly 30 km (along-strike) X 15 km (down-dip) rectangular asperity, with approximately 1 m maximum slip at a depth of 11 km. The total seismic moment 5.6X10 (super 18) N.m, corresponding to a moment magnitude M (sub w) 6.47, is slightly larger than the seismological estimate. The absence of fault slip in the upper 7 km of the crust suggests that this earthquake left an unruptured up-dip fault under the city of Pishan. Both the coseismic fault-slip distribution and the early postseismic deformation demonstrate that the S1A data have obvious superiority in monitoring earthquakes worldwide.


ISSN: 0895-0695
EISSN: 1938-2057
Serial Title: Seismological Research Letters
Serial Volume: 87
Serial Issue: 4
Title: Coseismic deformation of the 2015 M (sub w) 6.4 Pishan, China, earthquake estimated from Sentinel-1A and ALOS2 data
Affiliation: Central South University, School of Geosciences and Info-Physics, Laboratory of Radar Remote Sensing, Changsha, China
Pages: 800-806
Published: 201607
Text Language: English
Publisher: Seismological Society of America, El Cerrito, CA, United States
References: 20
Accession Number: 2016-076881
Categories: SeismologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch map
N37°23'60" - N37°43'60", E77°47'60" - E78°16'00"
Secondary Affiliation: China Earthquake Administration, CHN, ChinaHong Kong Polytechnic University, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201637
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