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一、前言在发生巨大地震概率较高的东海地区,布设着世界上无以类比的高性能和高密度的观测网。就 M8的巨大地震而言,其短期前兆现象会在直径超过100公里的大范围内出现,尽管东海—南关东地区的24小时连续监视体制尚不能称之为万无一失,却可看成是所谓东海地震短临预报的有效手段。而且,在根据“大地震对策特别措施法”所采取的各种措施和“地震防灾对策加强地区判定会”的设置以及认为 M8地震基本上可以预报的国民意识的基础上,地震防灾对策正在逐步推进。但是,除 M8的巨大地震袭击日本以外,M6—7的中等规模的地震也有很多,有时还造
I. INTRODUCTION In the East China Sea, where there is a high probability of earthquakes, there is an unparalleled high-performance and high-density observatory network in the world. In the case of the massive M8 earthquake, its short-term precursor phenomenon will occur over a large area of over 100 kilometers in diameter. Although the 24-hour continuous surveillance system in the East China Sea-South Kanto region can not be said to be foolproof, it can be regarded as the so-called East China Sea Earthquake short-term effective means of forecast. Furthermore, based on the various measures taken under the “Great Measures for Special Earthquake Countermeasures” and the establishment of the “Regional Judgment Meeting for Earthquake Disaster Prevention Measures” and the national awareness that the M8 earthquake can basically be forecasted, the earthquake disaster prevention measures Is progressing. However, apart from the M8 earthquake that hit Japan, there are many moderate-sized M6-7 earthquakes and sometimes