北祁连河西地区重力场变化及其与强震关系  

GRAVITY FIELD VARIATION AND ITS RELATION TO STRONG EARTHQUAKES IN NORTHERN QILIAN HEXI AREA

作　　者：祝意青[1] 梁伟锋[1] 操启明[1] 凌晔[1] 刘练[1] 

机构地区：[1]中国地震局第二地形变监测中心,中国西安710054

出　　处：《地震》1999年第4期345-351,共7页Earthquake

基　　金：国家"九五"科技攻关项目

摘　　要：通过对北祁连河西地区重力复测资料进行系统分析，从动态的观点研究了重力场演化及其与强震的关系。在观测期间，测区及其周边共发生７次ＭＳ≥５．０地震，流动重力均有一定的反映，并进行了一定程度的预测。重力变化的异常形态、变化量级和持续时间均与地震的发生有较好的相关性，而且重力场动态图像较清晰地反映了重力变化由地震孕育的非均匀态－ 发震－ 震后恢复的演化过程。In this paper, the repeatedly measured data of gravity in Northern Qilian Hexi area are analyzed; evolution of gravity field and its relation to strong earthquakes is studied from the viewpoint of dynamics. 7 earthquakes M S ≥5.0 occurred in and around the area during the measurement period are certainly reflected by mobile gravity, and are partly predicted to a certain extent. It is found that the anomaly pattern, amplitude and lasting time of gravity variation are well correlated with earthquakes; the gravity field dynamic pictures clearly show the evolutional process of gravity variation from inhomogeneous state before the earthquake to recovering after earthquake.

关 键 词：重力异常 地震前兆 重力场演化 北祁连 河西地区 

分 类 号：P315.7[天文地球—地震学] P312.1[天文地球—固体地球物理学]