大同-阳高二次地震前兆异常的对比分析  

Comparison and analysis of precursor anomaly before two Datong-Yanggao earthquakes

作　　者：王秀文[1] 赵新平[1] 赵丽华 彭浩[1] 

机构地区：[1]山西省地震局,中国太原030002 [2]太航中学,山西太原030006

出　　处：《地震》2000年第z1期188-195,共8页Earthquake

基　　金：中国地震局"九五"科研攻关项目!(95-1 3-0 3-0 6)

摘　　要：1 98 9年 1 0月和 1 991年 3月 ,在山西北部大同盆地先后发生 MS6.1、 MS5.8二次中强地震。对比这二次地震的序列、空间分布及能量释放存在很大差异。分析了前兆场的时空强特征 ,前兆异常机理。分析表明 ,大同 -阳高二次地震活动 ,是华北区域应力场增强 ,较大范围内应力增加和传递的结果。Two moderately strong earthquakes with MS 6.1 and MS5.8 occurred in t he Datong basin, North Shanxi province in October, 1989 and March 1991, respecti vely. There are great differences in seismic sequences, spatial distribution, an d energy release and so on between the two earthquakes. Characteristics of space -time-magnitude in precursory field and mechanism of precursor anomaly are ana ly zed. The analysis shows that the two earthquakes in Datong-Yanggao region are r e sulted from strengthening of the regional stress field in North China and increa sing and transmitting of stress in a large area.

关 键 词：地震前兆 异常特征 大同-阳高地震 

分 类 号：P315[天文地球—地震学]