大华北地区地电前兆时空特性研究  

TIME-SPACE CHARACTERISTICS OF GEOELECTRIC PRECURSORS IN LARGE NORTH CHINA REGION

作　　者：汪志亮[1] 余素荣[1] 谷永新 

机构地区：[1]国家地震局分析预报中心,中国北京100036

出　　处：《地震》1994年第S1期65-72,共8页Earthquake

摘　　要：文中较系统地研究了大华北地区单个地震的地电前兆场时空静态特征与成组地震的地电前兆场时空动态特征。在距震中200—500km范围内、相对集中的、中短期地电前兆趋势异常可能属孕震区的源兆。而在更大范围(近千公里)局部分散的临震前数十天内或某些中强地震前的地电短期前兆,可能属区域构造应力场兆。远震区临震异常的出现早于近震区。In this paper, we discussed systematically static and dynamic features of the precursors of single and group earthquakes in large North China region. The medium-and short-term precursory geoelectric trend anomalies which are relatively concentrated within 200-500km from the epicenters may be the source precursors of seismogenic zones. On the other hand, the short-term precursory geoelectric anomalies which disperse several ten days before the shock or appear befor the moderate and strong earthquakes within larger range (nearly 1000km) are probably the precursors of regional structural stress field. The appearance of the imminent anomalies in the teleseismic zone is earlier than that in the local zone.

关 键 词：地电前兆场 地电前兆时空静态特征 地电前兆时空动态特征 场兆 源兆 

分 类 号：P315.7[天文地球—地震学]