Abstract We use the data of 24 stations in the reservoir head area collected by Three Gorges reservoir induced earthquake monitoring system from 2016 to 2018, and use PALM method to analyze microseismic detection and positioning in Three Gorges reservoir area. A total of 12 814 seismic events are detected, which is about 4 times the number of seismic events in Three Gorges seismic network directory during the same period. The complete magnitude decreased from ML0.8 to ML0.3, proving that the PALM method is an effective way to improve the detection ability of seismic network. Based on the construction of a more comprehensive microseismic catalog, we delineate the spatial distribution characteristics of seismic activity in Three Gorges reservoir area. The results show that the focal depth in Badong area is relatively shallow, mostly within 5 km, mainly related to non-structural factors such as karst, coal mine collapse, and shallow unloading. The focal depth in Zigui area is relatively deep, mostly within 5 to 15 km, mainly related to the Jiuwanxi and Xiannüshan faults in the reservoir area.
JIANG Gongjin,ZHANG Lifen,ZHAO Yannan et al. Research on Microseismic Activity in Three Gorges Reservoir Based on PALM Automatic Detection Method[J]. jgg, 2024, 44(7): 753-758.
JIANG Gongjin,ZHANG Lifen,ZHAO Yannan et al. Research on Microseismic Activity in Three Gorges Reservoir Based on PALM Automatic Detection Method[J]. jgg, 2024, 44(7): 753-758.