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一、地震的基本情况 1984年5月21日23时38分上海市大多数居民从睡梦中被一阵剧烈震动所惊醒。这是由于在南黄海域发生的一系列地震中最初连续发生的两次地震引起的。上海市的地震烈度达到了五度。根据国家地震局地球物理研究所的中国台站临时报告提供的资料,1984年5月21日15时37分50秒(GMT)在北纬32.7°N、东径121.6°E发生了一次震级M_S=5.6的地震,时过1分08秒,即15时38分58.1秒,在同一震中附近,即北纬32.688°N、东径121.5O9°E又发生了一次震级为M_B=5.9、M_S=6.3的地震,震源深度18km。对于这两次地震,美国地震情报
I. Basic Conditions of the Earthquake At 21:38 on May 21, 1984, most of Shanghai’s residents were awakened by a violent vibration from their sleep. This is due to the first two consecutive earthquakes in a series of earthquakes that took place in the southern Yellow Sea. The earthquake intensity in Shanghai reached five degrees. According to the information provided by the China Station Interim Report of the Institute of Geophysics, the State Seismological Bureau, a magnitude M_S of 121.5 ° E at a latitude of 32.7 ° N at 15:37:50 on May 21, 1984 (GMT) 5.6 earthquake occurred. After 1 minute and 08 seconds, or 15:38 and 58.1 seconds, an earthquake magnitude of M_B = 5.9 and M_S = 6.3 near the same epicenter at latitude 32.688 ° N and 121.5O9 ° E Earthquake, focal depth 18km. For these two earthquakes, the United States earthquake intelligence