2020年唐山古冶M5.1地震震源区小震震源机制和应力场的求解

doi:10.12196/j.issn.1000-3274.2025.01.001

Abstract

Abstract: In order to study the stress state at the source region of the M5.1 earthquake occurred on July 12, 2020, a dense array was deployed in this area after the earthquake. 96 focal mechanism solutions and a fine crustal stress field of 0.25°×0.25° were obtained by using 20505 P-wave first motion polarity data in the earthquake source region and its adjacent area. The results show that: The focal mechanism of small earthquakes in the Guye earthquake region of Tangshan is mainly strike-slip type, followed by normal-fault type. The P-axis is NNE oriented with large of the plunge angle, while the T-axis NNW oriented with smaller plunge angle. Moreover, we found that there is a certain angle of deflection in the P-axis azimuth in the area near the Luanxian-Laoting fault, that is, from the NEE—SWW oriented deflection on the west side of the fault to the NW—SE oriented deflection on the east side of the fault, indicating the division of the stress field by the reverse-normal activity of the Luanxian-Laoting fault. The solution and analysis of the focal mechanism and stress field of small earthquakes can provide reference for further research in this area, especially in the area near the Luanxian-Laoting fault.

Key words: Comprehensive focal mechanism solution, Stress field, P wave initial motion, Dense array

CLC Number:

P315.2

YAN Shao-peng, WAN Yong-ge. Solution of Focal Mechanism and Stress Field by Small Earthquakes Data in Source Region of the Guye, Tangshan, M5.1 Earthquake in 2020[J]. EARTHQUAKE, 2025, 45(1): 1-15.

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Solution of Focal Mechanism and Stress Field by Small Earthquakes Data in Source Region of the Guye, Tangshan, M5.1 Earthquake in 2020

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