山西地震带形变应变场及中强地震危险性分析

Crustal deformation and strain field and analysis of moderately strong earthquake risk along Shanxi seismic belt

利用沿山西断裂带布设的 GPS监测网的四期复测资料 (1 996～ 1 999年 ) ,分析了山西断裂带近期水平运动状态及与位于监测区北端 1 999年 1 1月 1日大同 -阳高 5.6级地震的关系 ,在震源区、忻州地区和介休东北地区出现了 3处相对较高的应变区 (1× 1 0 - 6)。山西断裂带主要受来自于 NWW- SEE向压应力场、NNE- SSW向张应力场的控制 ,不存在走滑运动。从长趋势看 ,今后应注意的是上述

By using the repeated GPS observation data (1996～1999), the recent state of crustal horizontal movement along Shanxi fault belt is analyzed. The results show that: The activity of Shanxi belt is controlled by the NW, NWW SE, SEE compressional stress field and there is no strike slip movement. The horizontal movement in the south is less active than that in the north. The maximum value of local strain reaches 1×10 -6 .