大同—阳高6.1级地震前地下流体异常场特征

Characteristic of Ground Liquid Abnormal Field prior to the Datong Yanggao Earthquake

以《中国震例》中所收集的距大同—阳高６．１ 级地震震中３００ ｋｍ 范围内的２７项信度较高的地下流体异常为样本，利用统计的方法对地下流体异常点的时空特征及异常过程与场源特征进行了综合研究，结果表明，这些异常点所展示的特征具有时间上的同步性和空间上的差异性。指出，地下流体的中期异常主要是受区域应力场的控制；短临异常的出现反映了震源应力场的变化；异常的空间分布，主要是区域应力场和震源应力场相互作用的结果。

Based on 27 item high reliability's ground liquid anomaly which are in 300km away the epicenter and were collected in 《China Earthquake》,space time characteristic of ground liquid point and abnormal course and correlation between field and epicenter are researched. with statistical method,The result indicates that characteristic of these anomalies point has synchronism in time and discrepancy in space.Medium term anomalies is controlled basically by regional stress field, appearance of short impending anomalies remarks the variation of the epicenter stress field , the abnormal distribution is affected by action of regional stress field and focal stress field.