2023年12月18日甘肃积石山MS6.2地震多点源地震矩张量反演研究

doi:10.12196/j.issn.1000-3274.2024.02.012

Abstract

Abstract: Based on the observed seismograms from the regional broadband digital seismic network, the multi-point source seismic moment tensor inversion method is employed to perform the seismic moment tensor inversion for the 2023 Jishishan M_S6.2 main earthquake in Gansu province, China. The results show that the NE dipping nodal surface (strike 312°, dip 48°, and rake 76°) of the focal mechanism solution is the seismogenic fault. The majority of seismic moments are released from the source to the ground surface along the direction of the slip vector of the focal mechanism solution (azimuth 236°, plunge 40.5°), and the main rupture lasts about 5.8 s. At the same time, the secondary bilateral rupture occurred on the fault plane in the rupture zone of the earthquake.

Key words: Jishishan M_S6.2 earthquake, Seismic moment tensor, Multi-point source, Seismogenic tectonic

CLC Number:

P315.7

LIU Jun-qing, ZHANG Xiao-gang, ZHANG Yu, CAI Hong-lei, CHEN Zhuo, BAO Xiu-min. Study of Seismic Moment Tensor Inversion by Multi-point Sources for Jishishan M_S6.2 Earthquake on December 18, 2023, in Gansu Province, China[J]. EARTHQUAKE, 2024, 44(2): 169-177.

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Study of Seismic Moment Tensor Inversion by Multi-point Sources for Jishishan M_S6.2 Earthquake on December 18, 2023, in Gansu Province, China

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Study of Seismic Moment Tensor Inversion by Multi-point Sources for Jishishan MS6.2 Earthquake on December 18, 2023, in Gansu Province, China

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Study of Seismic Moment Tensor Inversion by Multi-point Sources for Jishishan M_S6.2 Earthquake on December 18, 2023, in Gansu Province, China