Dynamic triggering of earthquakes north of Xiaojiang Fault, Yunnan

Yuexin Li, Roland Bürgmann, Hongfeng Yang, & Shiyong Zhou

Submitted August 14, 2017, SCEC Contribution #7683, 2017 SCEC Annual Meeting Poster #062

Dynamic triggering is a ubiquitous phenomenon that has been well-documented all around the world. Most dynamic triggering cases are observed through visually inspecting their spectrograms and seismic records, and the triggered earthquakes are located by hand-picked P and S phases. The rise of dense array deployments and the optimization of earthquake detection techniques allows for the detection of more microearthquakes. The inclusion of microearthquakes in event catalogs allows us to better understand the patterns of dynamic triggering. We conducted a systematic search of local earthquakes triggered by distant large earthquakes north of the Xiaojiang Fault (XJF), Yunnan, China. Surface-wave arrivals of 7 out of 36 teleseismic earthquakes were found to have been accompanied by local small earthquakes with significant β statistic increases. We also generated a triggering potential map based on station records north of XJF. A triggering intensity map based on the fractional seismicity rate change north of XJF was also calculated. The comparison of the two maps helped us probe the strain state of the fault and gives insight into moderate strong earthquake initiation.

Key Words
Dynamic triggering,Dynamic stress,Seismicity rate,Triggering potentia,Triggering Intensity

Li, Y., Bürgmann, R., Yang, H., & Zhou, S. (2017, 08). Dynamic triggering of earthquakes north of Xiaojiang Fault, Yunnan. Poster Presentation at 2017 SCEC Annual Meeting.

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