日本至中国东北区域构造应力场分布与Benioff带的形态关系研究

收集2 291个来源于NIED F-net宽频带地震台网中心M_W≥3.0地震的震源机制解，采用MSATSI构造应力反演方法，得到反映应力相对大小的R值的量θ和3个主应力轴的方位角与倾伏角，同时反演出每个网格的极射赤平投影P、T轴。以3D应力反演为导向，采用矩阵网格分区的方法，以纬度、经度、深度为坐标，将发生在每一区域的震源机制解投射到相应的矩阵区中，并反演出每个矩阵网格点的应力场变化及分布情况。反演结果表明，与板块交接的浅部区域不仅受到太平洋板块的挤压俯冲，同时也受北美板块的斜插作用；东北区域的深震为Benioff带俯冲作用的结果。

Study on the Relationship between the Distribution of Tectonic Stress Field and the Shape of Benioff Zone from Japan to Northeast China

We collect a total of 2291 focal mechanism solutions of M W≥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.