Partial Coupling and Earthquake Potential Along the Xianshuihe Fault, China,Journal of Geophysical Research: Solid Earth

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Partial Coupling and Earthquake Potential Along the Xianshuihe Fault, China
Journal of Geophysical Research: Solid Earth ( IF 3.9 ) Pub Date : 2021-07-02 , DOI: 10.1029/2020jb021406
Yuexin Li ₁ , Roland Bürgmann ₁

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The left-lateral Xianshuihe Fault is located at the eastern boundary of the Tibetan Plateau and is one of the most active faults in China. It is associated with substantial seismic potential, with more than 20 Mw > 6 earthquakes since 1700. The fault has been documented to be creeping at the surface for decades; however, the spatial and temporal distributions of shallow creep along the fault are not well resolved. In this study, we obtain high-resolution interseismic velocity maps along the 350-km-long central Xianshuihe Fault and Interferometric Synthetic Aperture Radar (InSAR) time series along the Kangding segment using ascending and descending Sentinel-1 data. The InSAR data reveal multiple creeping sections and the estimated surface creep rates show high along-strike variability. A coupling model characterizes the distribution of creep with depth. The seismic potential of apparent rupture asperities along the Xianshuihe Fault is further refined by considering fault-crossing baseline data and the distribution of historical ruptures and microseismicity. Moreover, a stress-driven afterslip model of the observed accelerated creep around the Mw 5.9 2014 Kangding rupture indicates substantial shallow afterslip, which provides further constraints on the distribution of locked and creeping patches along this section of the Xianshuihe Fault.

更新日期：2021-07-20

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