Journal
SEISMOLOGICAL RESEARCH LETTERS
Volume 88, Issue 4, Pages 1054-1064Publisher
SEISMOLOGICAL SOC AMER
DOI: 10.1785/0220170019
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Funding
- polar project Mapping and monitoring land surface and permafrost conditions along the Inuvik-Tuktoyaktuk Highway corridor using satellite data and process-based modelling at the Canada Center for Mapping and Earth Observation (CCMEO)
- National Science Foundation of China [41104028, 41104001, 41204004, 41574035]
- Earth Observatory of Singapore (EOS)
- National Research Foundation (NRF) Singapore
- Singapore Ministry of Education under the Research Centres of Excellence initiative
- Canadian Space Agency (CSA) Data Utilization and Applications Program (DUAP) Interferometric Synthetic Aperture Radar (InSAR) project at the Canada Center for Mapping and Earth Observation (CCMEO)
- JAXA under the RA6 program [3159]
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We use Sentinel-1A/1B Terrain Observation with Progressive Scans (TOPS) data to map coseismic and postseismic displacements for the 25 November 2016 M-w 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 similar to 0.25 m 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 degrees +/- 4 degrees. 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 x 10(18) N.m, equivalent to an earthquake of M-w 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 similar to 10 mm/yr on this structure. The recent large strike-slip earthquakes in this area, that is, the 2015 M-w 7.2 Tajikistan earthquake (left-lateral) and 2016 M-w 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.
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