The Characteristics of the Focal Mechanisms of the Ma'erkang MS6.0 Earthquake Sequence in 2022
In this paper,the focal mechanism solutions of 22 events of the Ma'erkang MS6.0 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 MS6.0 earthquake sequence is mainly compressed in NWW-SEE direction by the regional horizontal stress field.The focal mechanisms of the three MS≥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 MS6.0 earthquake sequence is triggered by multiple planes.The three MS≥5.0 earthquakes were caused by differ-ent faults.The strike of the fault planes of the MS5.8 and the MS6.0 earthquake are in NNW direction;the rupture of the planes is right-lateral and strike-slip.The strike of the fault plane of the MS5.2 earthquake is in NE direc-tion;its rupture is left-lateral and strike-slip.The fault planes of the three earthquakes are approximately verti-cal.
万方数据
维普
