川西地区重力变化与汶川地震  

GRAVITY VARIATION OF WESTERN SICHUAN AND WENCHUAN EARTHQUAKE

作　　者：祝意青[1] 苏琴[2] 梁伟锋[1] 刘芳[1] 

机构地区：[1]中国地震局第二监测中心,西安710054 [2]四川省地震局,成都610000

出　　处：《大地测量与地球动力学》2010年第2期1-5,共5页Journal of Geodesy and Geodynamics

基　　金：国家科技攻关计划(2008BAC44B02-0103);国家自然科学基金(40874035)

摘　　要：利用川西地区1998—2008年流动重力观测资料获得的区域重力场时空动态变化结果,分析川西地区重力场变化特征及其与汶川8.0级地震的关系,结果表明:1)重力变化与断裂构造活动存在密切空间联系,重力测量较好地反映了伴随活动断层的物质迁移和构造变形引起的地表重力变化效应;2)汶川地震孕育发生阶段,重力场出现较大范围的区域性重力异常,重力场动态图像较清晰地反映了本区重力场由准均匀态-地震孕育的非均匀态-发震的演化过程。On the basis of mobile gravity observation data from 1998 to 2008 in western Sichuan, spatial dynamic variation results of regional gravity field are obtained, the relations between the gravity variation features and Wenchuan Ms8.0 earthquake are systematically analysised. The results show ： 1 ） gravity change is closely related to active fault tectonics, gravity measurement can reflect material migration accompanying active fault and crustal tectonic activity well. 2）The regional gravity variations in a wide range appeared during Wenchuan earthquake. The dynamic patterns of gravity field mirrored the evolution process of gravity field ： quasi-homogeneous state-non-homogeneous state-earthquake oecurence.

关 键 词：川西地区 重力观测 地壳运动 重力变化 汶川地震 

分 类 号：P315.726[天文地球—地震学]