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Study of the Seismogenic Structure of the October 12th, 2019 MS5.2 Beiliu Earthquake, Guangxi, China
BI Lisi, LU Banghua, YANG Xuan, WU Bin
Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology, Guangdong Earthquake Agency, Guangzhou 510070, China
摘要:
On October 12th, 2019, a MS5.2 earthquake occurred in Beiliu City, Guangxi Zhuang Autonomous Region, China, with a focal depth of 10 km. The epicenter is located in the junction of Guangxi and Guangdong where the moderate-strong earthquakes are relatively active. The highest intensity of this earthquake is estimated up to Ⅵ besides the isoseismic line showed an ellipse shape with a long axis trend in the NW direction. The aftershocks are not evenly distributed. The parameters of the focal mechanism solutions are:strike 346°, dip 85°, rake 19° for the nodal planeⅠ, and strike 254°, dip 71°, rake 175° for the nodal planeⅡ. The type of the coseismic fault is strike-slip. After analyzing these results above and the active faults near the epicenter, we get that the nodal planeⅠ is interpreted as the coseismic rupture plane and the Bama-Bobai Fault is a seismogenic structure of MS5.2 Beiliu earthquake.
关键词:  MS5.2 Beiliu earthquake  Seismogenic structure  Border area between Guangdong and Guangxi  Bama-Bobai Fault
DOI:10.19743/j.cnki.0891-4176.202002007
分类号:
基金项目:This Project is sponsored by the National Natural Science Foundation Guangdong Union Foundation (U1901602).
Study of the Seismogenic Structure of the October 12th, 2019 MS5.2 Beiliu Earthquake, Guangxi, China
BI Lisi, LU Banghua, YANG Xuan, WU Bin
Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology, Guangdong Earthquake Agency, Guangzhou 510070, China
Abstract:
On October 12th, 2019, a MS5.2 earthquake occurred in Beiliu City, Guangxi Zhuang Autonomous Region, China, with a focal depth of 10 km. The epicenter is located in the junction of Guangxi and Guangdong where the moderate-strong earthquakes are relatively active. The highest intensity of this earthquake is estimated up to Ⅵ besides the isoseismic line showed an ellipse shape with a long axis trend in the NW direction. The aftershocks are not evenly distributed. The parameters of the focal mechanism solutions are:strike 346°, dip 85°, rake 19° for the nodal planeⅠ, and strike 254°, dip 71°, rake 175° for the nodal planeⅡ. The type of the coseismic fault is strike-slip. After analyzing these results above and the active faults near the epicenter, we get that the nodal planeⅠ is interpreted as the coseismic rupture plane and the Bama-Bobai Fault is a seismogenic structure of MS5.2 Beiliu earthquake.
Key words:  MS5.2 Beiliu earthquake  Seismogenic structure  Border area between Guangdong and Guangxi  Bama-Bobai Fault