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[1]YANG Yuncun,JIANG Jinzhong,LIU Kexiang,et al.Research on the Characteristics of the Mangshi ML4.0 Earthquake Sequence in 2023[J].Journal of Seismological Research,2025,(01):10-21.[doi:10.20015/j.cnki.ISSN1000-0666.2025.0002 ]

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Research on the Characteristics of the Mangshi M_L4.0 Earthquake Sequence in 2023

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: Number of periods: 2025 01 Page number: 10-21 Column: Public date: 2024-12-20

Title:: Research on the Characteristics of the Mangshi M_L4.0 Earthquake Sequence in 2023

Author(s):: YANG Yuncun¹; JIANG Jinzhong¹; 2; LIU Kexiang¹; WANG Hualiu¹; SUN Zigang¹; YANG Mingchang¹; (1.Yunnan Earthquake Agency,Kunming 650224,Yunnan,China；2.Kunming Institute of Prediction,China Earthquake Administration,Kunming 650224,Yunnan,China)

Keywords:: the Mangshi earthquake swarm; double difference positioning; CAP inversion; earthquake activity; fluid diffusion

CLC:: P315.72

DOI:: 10.20015/j.cnki.ISSN1000-0666.2025.0002

Abstract:: Based on the broadband seismic waveform data and seismic phase reports produced by the Yunnan Seismic Network and the Tengchong Volcano Network,as well as the latest developed high-resolution common velocity model(Version 2.0)of the Crust in Sichuan-Yunnan region,the double-difference relative positioning method combined with waveform cross-correlation techniques is used to relocate 442 earthquakes in the Mangshi,Yunnan M_L4.0 earthquake sequence in 2023.The CAP method is used to invert the focal mechanism solution of the M_L≥3.5 earthquakes in the sequence,and the seismogenic mechanism of the sequence is studied in depth to explore whether this sequence is a foreshock sequence or just an ordinary earthquake swarm.Through the double-difference location method,precise locations of 363 earthquakes are obtained.Their epicenters are distributed in NE direction,and these earthquakes are distributed in a triangular shape.The optimal double-couple mechanism solution of the main shock,the M_L4.0 earthquake,is obtained through CAP waveform inversion:the nodal Plane I strikes 45 °,the dip angle is 70 °,and the sliding angle is -61 °.The nodal Plane II has a strike of 167 °,an inclination of 35 °,a slip angle of -143 °,a moment magnitude(M_W)of 3.91,and an optimal depth of 7 km.The temporal and spatial distribution characteristics of this earthquake sequence,the focal mechanism solution information,the travel time difference(S-P),the regional geological structure and the earthquake activity through the comprehensive precise positioning are used to explore the seismogenic structure and the seismogenic environment of this earthquake swarm.The results show that this earthquake swarm is not a foreshock sequence,but an ordinary earthquake swarm(magnitudes between 3 to 4).This earthquake sequence occurred on at least two faults.The faults are in high stress state and form an angle.The underground fluid affected this earthquake sequence's evolution at different stages.

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Last Update: 2025-01-01