2012年以来新丰江水库区地震震源机制解及构造应力场时空变化特征

doi:10.12196/j.issn.1000-3274.2022.03.005

Abstract

Abstract: The seismic activity and the distribution of focal mechanism and tectonic stress filed are of great significance for understanding the characteristics and genetic mechanism of induced earthquakes in the Xinfengjiang reservoir. Based on 142 seismic events (M_L≥2.0, 2012—2018), we calculated the focal mechanism solutions with FOCMEC method and invert the regional stress field with SATSI method. Then, we discussed the spatio-temporal variation of the tectonic stress field in Xinfengjiang reservoir. The results show that the earthquake rupture type in Xinfengjiang reservoir is mainly normal-faulting type with partial dip-slip components, and the second is strike-slip type. The advantageous directions of P-axis are NWW—SEE, and the plunge is close to vertical; the advantageous directions of T-axis are NNE—SSW, and the plunge is close to horizontal. The entire reservoir is mainly under action of the vertical extrusion of NWW—SEE and the horizontal stretching of NNE—SSW, and the stress is of normal-faulting type. From the NW—SE direction in the southeast to the NWW—SEE direction in the northwest, the maximum principal stress axis shows a counterclockwise rotation, with the rotation angle of about 18°, and the type of stress filed is changed from normal-faulting to strike-slip. Since 2012, the stress field of various regions in Xinfengjiang reservoir has been in a relatively stable state, but relatively large changes may occur in 2015 and 2018. Whether there is any variations of maximum principal stress axis in the studied region is unknown according to present calculation results, which need to be further verified.

Key words: Xinfengjiang reservoir, Focal mechanism, Tectonic stress field, FOCMEC, SATSI

CLC Number:

P315.7

JIANG Xi-jiao, LIN Qing-xi, GONG Xuan, YANG Xuan. Earthquake Focal Mechanism Solutions and Spatio-temporal Variations of Tectonic Stress Field in Xinfengjiang Reservoir since 2012[J]. EARTHQUAKE, 2022, 42(3): 64-80.

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Earthquake Focal Mechanism Solutions and Spatio-temporal Variations of Tectonic Stress Field in Xinfengjiang Reservoir since 2012

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