晋冀豫交界构造应力场分析

筛选晋冀豫交界2008-2017年468个地震的1 143个P波初动符号，应用综合震源机制解方法，反演该区域构造应力场，结果表明：①晋冀豫交界精细应力场整体受NE向P轴和NW向T轴控制，且P轴和T轴倾角近水平；②薄壁断裂以东出现局部应力场紊乱，安阳南断裂东南部应力场P轴由NE转为NEE至EW向，T轴呈放射状，从NW向逐渐转为NWW向，且倾角较大；③晋冀豫交界除符合华北应力场整体特征外，还具有局部构造应力场独特性。

Research on the tectonic stress field in sub-regions of Shanxi,Hebei and Henan

By using the 1 143 P wave first motion polarity data from 468 earthquakes with 2008 to 2017 in sub-regions of Shanxi, Hebei and Henan. The composite focal mechanisms are determined in sub-regions of Shanxi, Hebei and Henan by active seismicity. ①The gross stress field in sub-regions of Shanxi, Hebei and Henan shows NE compression and NW extension which have a horizontal radial angle; ② The local stress field in Bobi fault shows local stress field disorder, and the south of Anyang fault with Shanxi, Hebei and Henan shows NE to EW compression and has a high radial angle extension; ③ Inversion results show that except for the control of the overall tectonic background in North China, the stress fields in sub-regions have their distinct characteristics.