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已经平静了的伊豆半岛东部海域的震群活动从1984年9月8日晨开始重新活跃起来。从凌晨1时7分到上午10时48分(当地时间)之间曾四次在大岛,网代一带观测到烈度为1度(日本气象厅烈度标准,下同)的微震。10时33分前后,发生了估计震级为4.5的地震,大岛、馆山烈度为3度(弱震),网代、石廊崎、新岛等地烈度为2度(轻震)。人体感觉不到的微小地震也急剧增加,同一天到10时为止的30分钟之内共发生了68次。把微小地震也计算在内的地震次数迄今已超过三千次。伊豆地区居民担心地震的不安感正在逐渐升级。地
The already swirling earthquake swarm in the eastern waters of the Izu Peninsula reactivated from the morning of September 8, 1984. A microseismic intensity of 1 degree (Japan Meteorological Agency intensity standard, the same below) was observed four times between 1:07 a.m. and 1:48 a.m. (local time) on the Oshima and Nondai areas. Around 10:33, an earthquake with an estimated magnitude of 4.5 occurred. The intensity of Oshima and Tateyama is 3 degrees (weak earthquake), and the intensity of the net is 2 degrees (mild earthquake) on the Neimenggu, Stone Langzaki and Xindadao sites. Earthquakes, which the human body can not feel, also increased sharply, 68 times within 30 minutes of the same day until 10 o’clock. The number of earthquakes that has also been counted for minor earthquakes has so far exceeded three thousand. Residents in the Izu area are worried that the quake will be gradually escalated. Ground