张北6.2级地震地形变前兆演化特征  

PRECURSORY EVOLUTION CHARACTERISTICS OF GROUND DEFORMATION BEFORE ZHANGBEI M_S 6.2 EARTHQUAKE

作　　者：车兆宏[1] 谢觉民[2] 张晶[3] 范燕[1] 

机构地区：[1]中国地震局综合观测中心,中国北京100039 [2]中国地震局第一地形变监测中心,中国天津300180 [3]中国地震局分析预报中心,中国北京100036

出　　处：《地震》1999年第4期315-322,共8页Earthquake

摘　　要：分析了张北６．２ 级地震前后华北地区水准、ＧＰＳ、重力、定点形变、流动形变、地应变观测资料及前兆的演化过程。结果表明，深大构造对背景场起着控制及传递的作用；震中区位于经历了剧烈地壳运动后近年处于相对平静的地区；背景场与前兆异常动态过程的密切配合，是作出正确震情判定的关键；前兆异常在震后的新发展，在震后趋势预测中有重要作用。We have analyzed the evolutional process of precursors, including observational data of leveling, GPS, gravity, deformation at fixed observational sites, mobile geodetic deformation and ground strain before and after the Zhangbei M_S6.1 earthquake. The results indicate that the deep seated major fault plays a controlling and transferring role for the background field, and the epicentral region is situated at the relatively quiet region in recent years, which has experienced violent crustal movement. The closed coordination of background field with dynamic process of precursory anomaly is a key to the correct seismic situation determination. The new development of precursory anomaly after the earthquake is of great significance in postseismic trend prediction.

关 键 词：地形变 前兆异常 演化特征 张北地震 地震前兆 

分 类 号：P315.7[天文地球—地震学]