张北6.2级地震及大同5.6级地震前的流动重力异常  

The gravity anomaly before Zhangbei M6.2 and Datong M5.6 earthquakes

作　　者：苏树朋[1] 

机构地区：[1]河北省地震局保定地震中心台,河北保定071000

出　　处：《华北地震科学》2007年第4期55-58,共4页North China Earthquake Sciences

摘　　要：绘制了重力的时序变化曲线和空间等值线,从动态的角度分析了1998年张北6.2级地震和1999年大同5.6级地震前后的流动重力异常的演化及特征。结果显示,地震的孕育过程与重力场变化有关,地震发生在重力下降的异常时段,震中位于重力变化高梯度区。The Temporal sequence curves and spatial isolines of gravity variation are drawn, and the dynamic variation and its characteristics of gravity anomalies before Zhangbei 6.2 and Datong 5.6 earthquales in 1999 are analyzed. The results show, the process of seismogeny is relative to the variation of gravity field; earthquakes usually occur in the descending period of gravity; the epicenters are usually located at high grads region.

关 键 词：张北地震 大同地震 流动重力 异常特征 

分 类 号：P315.72[天文地球—地震学]