摘要
本文对1979至1989年发生在晋冀蒙交界地区的丰镇、万全、阳原、大同等7次M_L≥4.5地震前的调制小震异常指标进行了研究。发现在中强地震发生前受固体潮调制的小震随时间、空间的分布都具有明显的特征。1.当调制比出现异常后3个月内该区将会发生M_L≥4.5地震。其预报率为72％。2.较强地震发生在孕震区、带的交汇处。结果表明调制小震异常对判定晋冀蒙交界地区中强地震发生的危险时段具有一定的震兆意义。
This paper studied the anomaly index of modulated small earthquakes before 7 ML≥4.5 earthquakes in Fengzhen, Wanquan and Datong in Shanxi-Hebei-Inner Mongolian border region from 1979 to 1989. It is found that the distribution of small earthquakes modulated by the solid tide is of obvious features with time and space before the occurrence of moderately strong earthquakes. Within 3 months after occurrence of the anomaly of the modulation ratio Ml ≥ 4.5 earthquakes will occur in the area. The prediction rate is 72%; 2. Stronger earthquakes occurred in the convergent site of seismogenic regions or zones. Results show that the anomaly of modulated small quakes is of a certain seismic precursory significance for determining the risk time-interval and zoning of the moderately strong earthquake occurrence in Shanxi-Hebei-Inner Mogo-lian region.
出处
《地震》
CSCD
北大核心
1992年第5期54-60,共7页
Earthquake
