【摘要】 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。更多还原

【Abstract】 In the paper,the maximum principal stress and shear in depth 15 km of the earth was calculated with 239 GPS sites data observed during 2004 and 2007 in north-south seismic belt of china.The results were compared with moderate strong earthquakes occurred in the observation time period.The computed results showed that variation of stress was larger in western part of north-south seismic belt,such as western Sichuan and Yunnan province;the com-seismic occurred in western part of north-south seismic belt where there is big active faults.The spatial distribution of strong seismic coincided with the variation of stress and maximum principal stress in Sichuan province before Wenchuan earthquake.更多还原