2021年云南漾濞MS6.4地震震前地壳形变特征研究

doi:10.12196/j.issn.1000-3274.2022.03.002

Abstract

Abstract: In May 2021, a series of moderate earthquakes occurred in Yangbi, Yunnan Province, which seriously threatened the safety of people’s lives and property. The epicenter of Yangbi M_S6.4 earthquake is located near the Weixi—Qiaohou—Weishan fault in the South Yunnan block. The seismogenic fault is a newly discovered fault with a strike of 135°. Based on GPS observation data from 1998 to 2020, the long-term crustal movement velocity field in the study area is obtained, and the horizontal deformation background characteristics of the regional crust before these strong earthquakes in Yangbi are studied, as well as its relationship with the occurrence of earthquakes. Combined with the structural analysis, it is considered that the Yangbi earthquake occurred in the area where GPS horizontal velocity steeply change. Here the horizontal crustal movement was blocked and the strain accumulation is obvious with the high value area of surface strain rate and maximum shear strain rate. The seismogenic faults in this area are mainly affected by dextral shear and E-W extension.

Key words: the 2021 Yangbi M_S6.4 earthquake, South Yunnan, GPS baseline, Crustal deformation

CLC Number:

P315.7

ZOU Fang, MENG Guo-jie, SU Xiao-ning, WU Wei-wei, ZHAO Qian, SHE Ya-wen, Thant Myo. Characterstics of Tectonic Deformation before the 2021 Yangbi M_S6.4 Earthquake in Yunnan[J]. EARTHQUAKE, 2022, 42(3): 21-36.

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Characterstics of Tectonic Deformation before the 2021 Yangbi M_S6.4 Earthquake in Yunnan

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Characterstics of Tectonic Deformation before the 2021 Yangbi MS6.4 Earthquake in Yunnan

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Characterstics of Tectonic Deformation before the 2021 Yangbi M_S6.4 Earthquake in Yunnan