论文部分内容阅读
本文利用中国南北地震带2004-2007年间观测的239个GPS站数据,对中国南北地震带地壳内15km深处的最大主应力和最大剪应力进行了计算分析,并将计算结果与同期发生在中国南北地震带的地震活动进行了对比分析,结果表明观测同期发生的中强震大都位于应力变化大并且有深大断裂的地区,汶川地震进一步说明,四川地区地壳内的局部应力场变化与最大剪应力变化在空间分布上与强震活动区域存在较好的一致性。
In this paper, the maximum principal stress and the maximum shear stress within 15km depth in the crust of China’s northern and southern seismic belts are calculated and analyzed using 239 GPS stations observed from 2004 to 2007 in the North and South Seismic Belt of China. The calculated results coincide with those in China The results show that most of the moderately-strong earthquakes occurred in the same period are located in areas with large stress changes and deep faults. The Wenchuan earthquake further indicates that the local stress field in the crust of Sichuan Province changes with the maximum shear There is a good agreement between stress changes and strong earthquake activity in the spatial distribution.