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1984年5月21日,在南黄海海域的勿南沙一带发生M_s6.2级中强震。本文分析该地震序列的基本特征。 地震参数 从南京台513强震仪和南京台、连云港台DK-1仪器记录的地震波形可以清楚看出,在主震之前一分钟左右发生一次直接前震(图1)。根据江苏及邻区地震台网的仪器资料,测定前震参数如下:
On May 21, 1984, a moderate M_s6.2 moderate-strong earthquake occurred in the area of Not Nansha in the South Yellow Sea. This paper analyzes the basic features of the earthquake sequence. Seismic parameters It can be clearly seen from the seismic waveforms recorded by Nanjing Strait 513 and Nanjing-Taiwan and Lianyungang-Taiwan DK-1 instruments that a direct foreshock occurred about a minute before the main shock (Figure 1). According to the instrument data of the seismic network in Jiangsu and its neighboring areas, the foreshock parameters are determined as follows: