河北文安5.1级地震前的重力变化  

GRAVITY VARIATION BEFORE WENAN Ms5.1 EARTHQUAKE

作　　者：孙铭心[1] 刘善华[1] 杨怀宁[1] 

机构地区：[1]中国地震应急搜救中心,北京100049

出　　处：《大地测量与地球动力学》2008年第2期16-21,共6页Journal of Geodesy and Geodynamics

基　　金：地震科学联合基金(A07119)

摘　　要：对2006年7月4日河北文安5.1级地震孕育过程中首都圈重力场的异常变化和动态演化特征的研究结果表明:震前出现的重力上升—下降—上升变化是较明显的中短期异常反映;重力场动态图像较清晰地反映了研究区重力场的准均匀态—非均匀态—发震的演化过程;文安5.1级地震与2004年1月河北滦县5.0级地震的重力场变化具有相似特征。The anomalous variation and dynamic evolution characteristics of the gravity field in the Capitol region in the seismogenic process of the Wenan Ms5.1 earthquake on July 4,2006 are studied. The results show that the up-down-up variations of gravity before earthquake are the obvious reflection of medium-shout-term anomaly. The dynamic patterns of gravity field reflect clearly the evolutionary process of the gravity field： quasi-homogeneous state-non-homogeneous state-earthquake occurrence. There is similar evolution characteristics of the gravity field between Wenan Ms 5.1 earthquake and of Luanxian ML5.0 earthquake on January 20,2004.

关 键 词：文安地震 重力异常 重力场变化 孕震体膨胀 演化特征 

分 类 号：P315.726[天文地球—地震学]