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[1]WANG Ying,JIN Zhaodi,ZHAO Tao.The Characteristics of the Focal Mechanisms of the Ma'erkang MS6.0 Earthquake Sequence in 2022[J].Journal of Seismological Research,2024,47(03):379-390.[doi:10.20015/j.cnki.ISSN1000-0666.2024.0035 ]

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The Characteristics of the Focal Mechanisms of the Ma'erkang M_S6.0 Earthquake Sequence in 2022

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 47 Number of periods: 2024 03 Page number: 379-390 Column: 综述 Public date: 2024-05-01

Title:: The Characteristics of the Focal Mechanisms of the Ma'erkang M_S6.0 Earthquake Sequence in 2022

Author(s):: WANG Ying; JIN Zhaodi; ZHAO Tao; (Shaanxi Earthquake Agency,Xi'an 710068,Shaanxi,China)

Keywords:: S6.0 earthquake swarm' target='_blank'>the Ma'erkang M_S6.0 earthquake swarm; focal mechanism solution; moment tensor inversion; earthquake seqnence; seismogenic structure

CLC:: P315.72

DOI:: 10.20015/j.cnki.ISSN1000-0666.2024.0035

Abstract:: In this paper,the focal mechanism solutions of 22 events of the Ma'erkang M_S6.0 earthquake sequence were obtained with the method of full-waveform moment tensor inversion.The results show that these 22 earthquakes are strike-slip ones,and the trend of their fault plane is mainly in NNW direction and NE direction.The dip angle of the fault plane is approximately vertical,and the slip angle is close to 0° or 180°.The azimuth of the P-axis is in NWW-SEE direction,and the plunge angle is close to horizontal.This indicates that the activity of the Ma'erkang M_S6.0 earthquake sequence is mainly compressed in NWW-SEE direction by the regional horizontal stress field.The focal mechanisms of the three M_S≥5.0 earthquakes are slightly different from the focal mechanisms of other earthquakes in the sequence.According to the results of precise location,we believe that the Ma'erkang M_S6.0 earthquake sequence is triggered by multiple planes.The three M_S≥5.0 earthquakes were caused by different faults.The strike of the fault planes of the M_S5.8 and the M_S6.0 earthquake are in NNW direction; the rupture of the planes is right-lateral and strike-slip.The strike of the fault plane of the M_S5.2 earthquake is in NE direction; its rupture is left-lateral and strike-slip.The fault planes of the three earthquakes are approximately vertical.

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Last Update: 2024-05-01