【摘要】 利用山西流动重力测网资料和《GDPAS-MRG》软件,得到了2002年太原、2003年洪洞2次M_L5.0地震前后不同时空尺度的重力场动态变化图像,并利用小波变换方法将2000~2004年的山西重力场动态变化进行了多尺度分解,对不同时空小波尺度下的重力场变化进行了分析。结果表明:①这2次地震均发生在重力变化梯度带的"0"等值线附近;②通过小波变换可获得不同尺度下的重力场变化,且随着阶次的增加,深部构造活动信息更加突出。更多还原

【Abstract】 By using the software of GDPAS-MRG,we got the gravity field variation of different time and space scales before and after the 2002 Taiyuan earthquake,and the 2003 Hongdong earthquake. We then performed a wavelet multi-scale decomposition of 2000 ~ 2004 gravity field variation of Shanxi Province,and analyzed the accumulative changes of different time and space scales of gravity field in terms of wavelet transform. The above results demonstrate that:(1) The two earthquakes just occurred in the gravity gradient belt and zero line.(2) We can obtain the dynamic variation of different space-time scales of gravity field using wavelet transform,and many weak details are enhanced when the order is increased.更多还原