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[1]WANG Di,RAN Xiyang,LONG Feng,et al.Study on the Characteristics of Magnitude and Rupture-scale Calibration Law for Strong Earthquake Sequences in Sichuan-Yunnan Region[J].Journal of Seismological Research,2025,(03):370-381.[doi:10.20015/j.cnki.ISSN1000-0666.2025.0039 ]

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Study on the Characteristics of Magnitude and Rupture-scale Calibration Law for Strong Earthquake Sequences in Sichuan-Yunnan Region

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: Number of periods: 2025 03 Page number: 370-381 Column: Public date: 2025-04-15

Title:: Study on the Characteristics of Magnitude and Rupture-scale Calibration Law for Strong Earthquake Sequences in Sichuan-Yunnan Region

Author(s):: WANG Di; RAN Xiyang; LONG Feng; ZHAO Min; HE Chang; (Sichuan Earthquake Agency,Chengdu 610041,Sichuan,China)

Keywords:: Sichuan-Yunnan region; scaling law; rupture-scale; strong-earthquake sequence

CLC:: P315.5

DOI:: 10.20015/j.cnki.ISSN1000-0666.2025.0039

Abstract:: Based on the data of M_S≥5.0 earthquake sequences since 1970,and referring to the research results involving the source spectrum,the crustal deformation and the aftershock distribution in Sichuan-Yunnan region,we obtained the rupture-length of 125 earthquakes.Then we established the linear regression relation between the magnitude(M_S)and the logarithm of the rupture-scale(lg L)in Sichuan-Yunnan region by using the least square method.Further,we analyzed the characteristics of this scaling law based on three aspects:the type of source mechanism solution,the regional structures and the different seismic periods.We found that this relation varies in the context of the type of seismic dislocation and the spatial and temporal difference of earthquakes.Theoretically,for the earthquakes with the same magnitude,the rupture length of the thrust earthquake should be shorter than that of the strike-slip earthquake.When M_S≥5.5,the rupture length of the strike-slip earthquake is longer than that of the positive fault earthquake.When M_S≥6.5,the rupture-length of thrust earthquake is longer than that of the normal fault earthquake.When their magnitudes are the same,the rupture length of the isolated-type earthquake is shorter than the ones of other types of earthquakes.In addition,the high-quality observational data of the seismic network play a decisive role in calculating the rupture-scale of the earthquakes.

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Last Update: 2025-04-15