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[1]GU Huidong,JIANG Jinzhong,LI Jiao,et al.Focal Parameters and Seismogenic Structure of Two Earthquake Sequences in Yanjin,Yunnan[J].Journal of Seismological Research,2024,47(03):391-404.[doi:10.20015/j.cnki.ISSN1000-0666.2024.0040 ]

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Focal Parameters and Seismogenic Structure of Two Earthquake Sequences in Yanjin,Yunnan

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 47 Number of periods: 2024 03 Page number: 391-404 Column: 综述 Public date: 2024-05-01

Title:: Focal Parameters and Seismogenic Structure of Two Earthquake Sequences in Yanjin,Yunnan

Author(s):: GU Huidong¹; 2; JIANG Jinzhong¹; 2; 3; LI Jiao¹; ZHANG Yan¹; 3; YANG Yuewen¹; WANG Guangming¹; 3; ZHANG Shuai¹; 3; YAO Yuan¹; 3; (1.Yunnan Earthquake Agency,Kunming 650224,Yunnan,China;2.School of Earth Sciences,Yunnan University,Kunming 650504,Yunnan,China;3.Kunming Institute of Prediction,China Earthquake Administration,Kunming 650224,Yunnan,China)

Keywords:: the Yanjin earthquake sequence; focal mechanism; relocation; sPn phase; seismogenic structure

CLC:: P315.332

DOI:: 10.20015/j.cnki.ISSN1000-0666.2024.0040

Abstract:: Before and after the M_L5.2 earthquake in Yanjin,Yunnan Province on 23 January 2021,several medium and small earthquakes occurred in this region.In order to better assess the seismic hazard and identify the seismogenic structures in this region,we use the waveform data of the near earthquakes from the Yunnan Seismic Network and the Sichuan Seismic Network to invert the focal mechanisms and the depths of the M_L≥3.5 earthquakes in Yanjin by the cut-and-paste(CAP)method and two different velocity models.Then,we determine the depth of the M_L5.2 earthquake using the depth phase sPn.Finally,we employ the double-difference relocation method to relocate the earthquake sequences in Yanjin.We obtain that seismogenic fault of the isolated M_L5.2 earthquake sequence belongs to the thrust type.It strikes near the N-S direction and dips eastward at 50°.The M_L5.2 earthquake has a shallow source,the rupture occurred from the bottom to the top along the fault plane.The seismogenic fault of the swarm-type M_L3.9 earthquake sequence belongs to the strike-slip type.It strikes from NNW and dips northeastward at about 80°.The focal mechanisms of the three M_L≥3.5 earthquakes in this swarm-type sequence are slightly different,this may be due to the region's complex fault structure and stress environment.Based on this analysis,we believe that the seismogenic fault of the M_L3.9 earthquake sequence is the Yanjin-Junlian fault.The seismogenic fault of the M_L5.2 earthquake sequence is an unknown hidden fault in the near N-S direction and with a dip angle of about 50°,which is generated by the Huayingshan fault and the Yanjin-Junlian fault.

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