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1984年5月21日北京时间23时39分,在南黄海河豚沙一带发生M_s=6.2级中强震(32°28.7′N,121°35.4′E)。本文分析该地震序列及震前地震活动图象的基本特征。
On May 21, 1984, at 23:39 GMT, a M = 6.2 moderate-strong earthquake (32 ° 28.7’N, 121 ° 35.4’E) occurred in the Punta dolphin sand area of the South Yellow Sea. This paper analyzes the earthquake sequence and the basic characteristics of seismic images before the earthquake.