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TitleA slip gap of the 2016 Mw 6.6 Muji, Xinjiang, China, earthquake inferred from Sentinel-1 TOPS interferometry
AuthorFeng, WORCID logo; Tian, Y; Zhang, Y; Samsonov, SORCID logo; Almeida, R; Liu, P
SourceSeismological Research Letters vol. 88, no. 4, 2017 p. 1054-1064, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20170196
PublisherSeismological Society of America (SSA)
Mediapaper; on-line; digital
File formatpdf
AreaXinjiang; southwestern China; China
Lat/Long WENS 72.0000 76.0000 41.0000 38.0000
Subjectsgeophysics; tectonics; structural geology; Science and Technology; Nature and Environment; Health and Safety; earthquakes; remote sensing; tectonic setting; deformation; bedrock geology; structural features; faults, slip; modelling; aftershocks; fault systems; plate motions; plate margins
Illustrationslocation maps; graphs; plots; satellite images; tables
ProgramRemote Sensing Science
Released2017 05 31
AbstractWe use Sentinel-1A/1B Terrain Observation with Progressive Scans (TOPS) data to map coseismic and postseismic displacements for the 25 November 2016 Mw 6.6 Muji earthquake in southwestern Xinjiang, China. Two tracks (T27 and T107) of the TOPS data captured the coseismic deformation area with a maximum line-of-sight deformation of 0.25m in the descending track (T107). The inverted best-fitting coseismic slip model in this study shows that the mainshock was a right - lateral strike - slip rupture on the western segment of the Muji fault, with an optimal dip angle of 80°±4°. Two separated slip zones exist in the coseismic slip model, with the maximum slip of 1.6 m located in the western slip zone. The total geodetic moment is 9.87×1018N·m, equivalent to an earthquake of Mw 6.6. Our model shows that a patch between the two slip zones remained unruptured during the mainshock, indicating a potential future seismic risk. Aftershocks recorded in the first 45 days after the mainshock delineate the modeled rupture patches well. The components of the regional Global Positioning System velocities parallel to the Muji fault have been inverted to obtain an interseismic slip rate of 10 mm/yr on this structure. The recent large strike - slip earthquakes in this area, that is, the 2015 Mw 7.2 Tajikistan earthquake (left - lateral) and 2016 Mw 6.6 Muji earthquake (right - lateral), may be an indicator of conjugate fault systems at the west boundary between the Indian and Eurasian plates in response to north - south convergence produced by the collision of the two plates.
Summary(Plain Language Summary, not published)
This study was conducted with our automated InSAR processing system. Earthquake hazards are global concerns. With our developed InSAR system, we can have a very rapid response to a natural hazard globally if data is available. The results show that a slip gap still remains un-ruptured yet. This could imply a potential seismic risk for future. We also used GPS data to estimate the interseismic tectonic loading across the fault. An fast loading rate of ~10 mm/yr was estimated. This indicates that the region should have accommodated the tectonic loading with a set of faults, rather than the Muji fault alone, which should be meaningful for regional seismic risk assessment as well.

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