Microseismicity along Xiaojiang Fault Zone (Southeastern Tibetan Plateau) and the characterization of interseismic fault behavior

The Xiaojiang Fault (XJF) Zone locates in the southeastern of Tibetan Plateau and defines boundary between South China Sichuan-Yunnan blocks. Historical large earthquakes were hosted on XJF, though its seismic hazard near future is under debate. In this study, we utilize portable broad-band network to unravel microseismic activities along further investigate fault structures their properties. Adopting PALM, a newly developed earthquake detection algorithm, obtained ~13,000 relocated events. micro-seismicity reveals widespread off-fault showing conjugate geometry, while major faults present low seismicity. branches main-fault intensive microseismicity, which hosts repeating events presents high b-value. Regional GPS stations reflect slips are mostly concentrated slip rate correlates with these structures. Combining other recent seismological magnetotellurics evidences, suggest strength structures, may partially release tectonic stress loading serve as barrier for big earthquakes. On clustered junctions A special set clusters 25°N 25.5°N show an along-strike variation depth from 10 25-km, imaging creeping locked portions. We revisit problem conclude that XJF at late stage inter-seismic period.