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在日本国立防灾科学技术中心的地壳动力学实验室监测到东京地区平均每天发生16或17次“微震”。在过去的六年中,国立防灾科学技术中心已建立了71个台站,以观测约240公里内易发生地震的都市的地震和地壳运动,因为相信观测小震的图象将能对预期的“大地震”预先提供警告。现已观测到,东京地区较大地震的重复发生周期约为60—70年,在东京和横滨港造成了10万多人死亡的1923年关东大地震是最近的一次大地震。1978年建立了微震观测台网以收集数据,为较大地震之前有微小前震发生的理论提供证据,并希望能及时提醒居住在人口稠密的关东
In the Japan National Center for Disaster Prevention Science and Technology’s crustal dynamics laboratory, an average of 16 or 17 “microseisms” occurred in Tokyo every day. Over the past six years, the National Center for Science and Technology for Disaster Prevention has established 71 stations to observe the urban earthquakes and crustal movements that are prone to earthquakes in about 240 kilometers because it is believed that the observation of images of small earthquakes will be predictable The “big earthquake” in advance to provide a warning. The 1923 Kanto Earthquake, which killed more than 100,000 people in Tokyo and Yokohama, has been observed as the latest in a repeat earthquake cycle of about 60-70 years in Tokyo. In 1978, a microseismic observatory network was set up to collect data to provide evidence for the theory of minor pre-earthquake occurrences before major earthquakes and hoped to promptly remind people living in the densely populated Kanto