南黄海5.1级地震及趋势分析
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摘要
1997年7月28日南黄海发生5.1级地震,通过对5.1级地震序列分析,认为此次地震属于前—主—余震型地震序列。文中对5.1级地震前某些地震学异常进行了研究,结果表明:主震前存在中等地震活动集中,地震空区、低b值、地震应变释放加速等特点。结合5.1级地震的发生,对今后地震活动趋势进行了讨论,认为在研究区仍存在6级左右地震的背景性异常。
A M 51 earthquake occurred in southern Yellow Sea on July 28,1997The analysis of the earthquake sequence indicates that this is a sequence of foremainaftershock typeSome seismological anomalies before the mainshock showed that there appeared a spatial concentration of moderate earthquakes,seismic gaps,low bvalue and accelerating release of seismic strain before the mainshockThe discussion for the future seismicity in the studied region is made,suggesting that a M 60 earthquake might be possible
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