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\begin{document}

\title{Microseismicity along Xiaojiang Fault Zone (China) and the
Characterization of Interseismic Fault Behavior}



\author[1]{Yijian Zhou}%
\author[2]{Han Yue}%
\author[3]{Shiyong Zhou}%
\author[4]{Lihua Fang}%
\author[5]{Yun Zhou}%
\author[4]{Li-Sheng Xu}%
\author[6]{Ziming Liu}%
\author[3]{Teng Wang}%
\author[3]{Li Zhao}%
\author[7]{Abhijit Ghosh}%
\affil[1]{Department of Earth and Planetary Sciences, UC Riverside}%
\affil[2]{Beijing University}%
\affil[3]{Peking University}%
\affil[4]{Institute of Geophysics, China Earthquake Administration}%
\affil[5]{Institute of Geophysics, China Earthquake Administration, Beijing, China}%
\affil[6]{Institute of Theoretical and Applied Geophysics, Peking University, Beijing, China.}%
\affil[7]{University of California, Riverside}%


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  \date{May 29, 2024}


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



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