Dynamic deformation and fault locking of the Xianshuihe Fault Zone, Southeastern Tibetan Plateau: implications for seismic hazards

Abstract The Xianshuihe Fault Zone is one of the most historically seismically active regions in mainland China. However, seismicity along this fault zone has been quiescent for past 40 years, since Daofu M 6.9 earthquake 1981. Understanding its current deformation patterns and coupling characteristics great significance to estimate potential risk strong earthquakes. In study, we analyzed dynamic using Global Navigation Satellite System (GNSS) data 1999–2007 2016–2020. results show that pattern underwent a adjustment after 2008 Wenchuan w 7.9 2013 Lushan 6.6 earthquakes, i.e., maximum shear strain accumulation rates Luhuo sections significantly decreased from 6.0 × 10 –8 /a 3.2 /a, while southeastern segment (i.e., Kangding Moxi sections) increased 4.5 6.2 /a. Additionally, slip rate width also changed during these two periods. Combined with near-field cross-fault observation data, suggest surrounding earthquakes had evident differential impacts on Zone. fault-coupling inversion locking degree continued increase especially Qianning significantly, an average coefficient greater than 0.9 left-lateral slip-rate deficits ~ 5 mm/a 8 mm/a, respectively. contrast, section almost no deficit, which state creeping status. analysis recent rupture history indicates both have high seismic next Graphical