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[1]SUN Nan,HE Suge,LIU Zifeng,et al.Study of the Laos MS6.0 Earthquake Sequence in 2021[J].Journal of Seismological Research,2025,(01):1-9.[doi:10.20015/j.cnki.ISSN1000-0666.2025.0001 ]

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Study of the Laos M_S6.0 Earthquake Sequence in 2021

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: Number of periods: 2025 01 Page number: 1-9 Column: Public date: 2024-12-20

Title:: Study of the Laos M_S6.0 Earthquake Sequence in 2021

Author(s):: SUN Nan; HE Suge; LIU Zifeng; LI Libo; (Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)

Keywords:: the Laos M_S6.0 earthquake; foreshock sequence; aftershock sequence; sequence parameter

CLC:: P315.72

DOI:: 10.20015/j.cnki.ISSN1000-0666.2025.0001

Abstract:: The seismicity in Yunnan is related with the strong earthquake activities in its surrounding areas because of their “joint structures and homologic driving forces” .So,study of the earthquake evolution and the seismogenic structures in the vicinity will help predict the earthquakes in Yunnan.On November 24,2021,the Laos M_S6.0 earthquake occurred near the Zhengdong fault in Southwest Yunnan.Its focal mechanism reveals that the earthquake is a strike-slip fracture event.The rupture extends in consistent with the regional tectonic trend.The Laos M_S6.0 earthquake sequence is a typical foreshock-mainshock-aftershock sequence.The foreshock sequence has abundant M_S3.0 and M_S4.0 earthquakes.According to the parameters of the foreshock sequence,before the main shock the calculated b-value fluctuates with large amplitude,and h-value has an upward trend.On the other hand,in the aftershock sequence,variation of b-value and h-value is relatively stable.In addition,the coseismic Coulomb stress caused by the M_S6.0 mainshock may have a stress-loading effect on Yunnan region.

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Last Update: 2025-01-01