Two Earthquake Swarms Triggered by Heavy Rainfall Events in Jingxi, Guangxi

Under the background of continuous rainstorms, two significant sensible earthquake swarms occurred in Jingxi of Guangxi Zhuang Autonomous Region in July and August 2010 and June and July 2011, both of the earthquake swarms had caused certain social impaction and showed many characteristics different from those of typical tectonic earthquakes. The activity process, waveform and source parameter characteristics of two seismic swarms are analyzed, and the nature and genetic mechanism of the two seismic swarms are also discussed by combining the data and analytical methods of karst hydrogeology, geophysics and mechanics. The results are shown as follows: the two swarms are closely related to the process of heavy rainfall, the earthquakes mainly occur in the karst distribution area, and are mainly concentrated above the underground river karst pipeline system, with very shallow focal depth; The waveform records and source parameters of the two swarms is different from tectonic earthquakes. Based on the analysis of field survey data, it is concluded that two earthquake swarms may be caused by the fluid-triggered collapse of shallow karst.