日本海区板块俯冲与华北地震
SUBDUCTION OF THE PACIFIC PLATE IN THE SEA OF JAPAN AND EARTHQUAKES OF NORTHEASTERN CHINA
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摘要: 根据日本海西部17次深源地震(h>350公里,Mb>4.0)震源机制结果的统计分析,得到该区地震应力场的优势方向,主压应力轴为85°—110°,主张应力轴为255°—280°。 据日本海西部深源地震与华北、东北强震活动的相关性,求得地震迁移的距离与时间的回归方程。这个结果对华北地震的预报具有一定的意义。Abstract: Based on the results of focal mechanism solutions and statistical analysis for 17 deep-focus earthquakes (h>350km, M>4.0) occurred in the western part of the Sea of Japan, the dominant directions of the earthquake generating stress field are found as follows: the directions of the compressive and tensile principal stress axes are 85°—110° and 255°—280° respectively.According to the relation between the seismic activity of strong earthquakes of North and Northeast China and that of deep-focus earthquakes of the Sea of Japan, a time and distance regressive equation of seismic migration has been obtained. Using this result, it is probably helpful for predicting future earthquakes in northeastern China.
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