Abstract:We collect a total of 2 291 focal mechanism solutions of MW≥3.0 earthquakes from the NIED F-net broadband seismic network center. The MSATSI tectonic stress inversion method is adopted to obtain R value reflecting the relative stress and the azimuth and dip angles of the three principal stress axes. The polar projection P and T axes of each grid can also be acquired. This study is based on 3D stress inversion, using the method of matrix grid partition and taking latitude, longitude and depth as coordinates. The focal mechanism solutions in each region are projected into the corresponding matrix region. We calculate the change and distribution of the stress field of each matrix grid point. The results show that the shallow area connected with the plate is not only pushed and subducted by the Pacific plate, but also subject to oblique thrust by the north American plate. The deep earthquakes in northeast China are the results of Benioff zone subduction.
FENG Bing,LI Yang,WANG Wentao et al. Study on the Relationship between the Distribution of Tectonic Stress Field and the Shape of Benioff Zone from Japan to Northeast China[J]. jgg, 2021, 41(4): 425-431.