从重力场变化看攀枝花6．1级地震与宁蒗、盐源交界5．7级地震的关系

本文利用攀枝花和西昌地区2002—2012年流动重力观测数据，作出重力场动态图像和部分重力点值时序变化图像。通过分析重力场变化，研究2008年攀枝花6．1级地震与2012年宁蒗、盐源交界5．7级地震之间的关系，得出攀枝花6．1级地震使攀西地区构造活动加强，较强的构造活动使2012年宁蒗、盐源交界5．7级地震孕育和发生以及地震孕震过程和临震前重力场变化与攀枝花6．1级地震前的变化具有相似性的结论。

The relationship between the 2008 Panzhihua M6.1 Earthquake and the 2012 Ninglang - Yanyuan M5.7 Earthquake according to the data analysis of the field gravity measurement

The repeated gravity observation data from 2002 to 2012 in Panzhihua and Xicang areas has been used to draw dynamic pictures of gravity field and sequential gravity changes pictures at some stations observation sites. The relationship between the 2008 Panzhihua Ms6. 1 earthquake and the 2012 Ninglang - Yanyuan boundary region MsS. 7 earthquake has been studied. The results show that the Panzhihua Ms6.1 earthquake results from the tecton- ic activities in Panzhihua and Xicang areas. The strengthening tectonic activities result in the preparation and oc- currence of the Ninglang- Yanyuan boundary region Ms5.7 earthquake, 2012, and we conclude that there is the similarity before earthquake between the seismo-genic process and earthquake gravity changes.