1984年5月11日北京时间23时37分,南黄海海域发生6.2级地震(Ms,下同),仪器测定震中在北纬32.7°,东经121.7°,即江苏省如东县东海域河豚沙附近。震前54秒,曾有一5.6级直接前震,截止1984年6月10日,震源区共发生1.0级以上地震356次,最大震级为4.6级。地震没有对沿海建筑物造成严重破坏,亦没有人畜直接伤亡。由于地震发生在人口稠密、经济发 On May 11, 1984, at 23:37 Beijing time, a magnitude 6.2 earthquake occurred in the South Yellow Sea (Ms, the same below). The epicenter was measured at 32.7 ° N and 121.7 ° E, near the puffer sand in the East China Sea, Rudong County, Jiangsu Province . 54 seconds before the earthquake, there was a 5.6-level direct foreshock. As of June 10, 1984, a total of 356 earthquakes of magnitude 1.0 and above occurred in the focal area and the maximum magnitude was 4.6. There was no serious damage to the coastal structures caused by the earthquake and no direct human casualties. As the earthquake occurred in a densely populated economy