攀枝花6.1、姚安6.0级地震前后区域重力场变化  

VARIATION OF GRAVITY FIELD BEFORE AND AFTER PANZHIHUA Ms6.1 AND YAOAN Ms6.0 EARTHQUAKES

作　　者：祝意青[1,2] 郭树松[2] 刘芳[2] 

机构地区：[1]中国科学院测量与地球物理研究所动力大地测量学重点实验室,武汉430077 [2]中国地震局第二监测中心,西安710054

出　　处：《大地测量与地球动力学》2010年第4期8-11,18,共5页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(40874035);地震行业科研重点专项(200908029);国家科技攻关计划项目(2008BAC44B02-0103)

摘　　要：利用滇西地区重力观测资料,研究2008年8月30日四川攀枝花6.1级地震和2009年7月9日云南姚安6.0级地震前后区域重力场的动态演化特征。结果表明:重力观测资料较完整地反映了攀枝花6.1、姚安6.0地震孕育、发生过程中出现的流动重力前兆信息;重力场动态图像较清晰地反映了重力场由准均匀态-地震孕育到非均匀态-发震的演化过程。据此,对攀枝花6.1级地震后的地震趋势作了判定,并在姚安6.0级地震前作了年度预报。The repeatedly gravimetric data in western area of Yunnan Province are analyzed.The dynamic evolution characteristics of gravity field in the seismogenic process of the Panzhihua Ms6.1 earthquake on Aug.30,2008 in Sichuan Province and Yaoan Ms6.0 on Jul.9,2009 in Yunnan Province are studied and the following conclusions are drawn.1）The gravity observations reflected the precursory gravity information during the seismogenic process,the dynamic evolution pattern of gravity reflects clearly the gravity field＇s evolution of ＂quasi-homogeneous→heterogeneous then earthquake→quasi-homogeneous＂ in the process of the Pabzhihua Ms6.1 and Yaoan Ms6.0 earthquakes.2）The tendency after Panzhihua Ms6.1 earthquake are estimated and the annual prediction before Yaoan Ms6.0 earthquake are made.

关 键 词：滇西地区 重力场演化 趋势判定 地震预测 前兆信息 

分 类 号：P315.726[天文地球—地震学]