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日本的伊豆和茨城县附近是有名的地震频发地区。1983年4月26日在筑波科学城召开的地震学会上发表了东京大学地震研究所茂木清夫和国立防灾科学技术中心地震活动研究室室长大竹政和对这两个地区的有意义的数据进行分析的结果。即发生在伊豆的地震与潮汐的涨落有密切关系;发生在茨城的海上地震和内陆地震是成对的。这在地震预报方面也被作为一个重要的研究成果引起了有关方面的注目。伊豆半岛的东侧是地壳活动频繁的地区,1983年1月中旬至月底就出现过震群活动,1978年11月至1979年5月以及1980年也出现过震群活动。1980年6月24日起地震持续约1个
Japan’s Izu and Ibaraki Prefecture near the famous earthquake-prone areas. On April 26, 1983, at the Seismological Society held in Tsukuba Science City, Dajizhō, director of the Seismic Activity Research Office at the University of Tokyo Institute of Seismology and director of the National Disaster Prevention Science and Technology Center, published the data meaningful for these two regions Results of the analysis. That is, the earthquakes that occurred in Izu are closely related to the tidal fluctuations; the maritime and inland earthquakes that took place in Ibaraki are paired. This has also drawn the attention of relevant parties as an important research result in earthquake prediction. On the eastern side of the Izu Peninsula, there are frequent crustal activities. Swarm swarms occurred from mid-January to the end of January 1983 and swarm swarms occurred from November 1978 to May 1979 and 1980. The earthquake lasted about 1 on June 24, 1980