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据日本《朝日新闻》1977年3月9日报道,为了探索袭击首都圈的直下型地震,国立防灾科学技术中心在千叶县沼南町开钻用以观测地震的深井。井深二千五百米,准备安装高灵敏度的地震仪和倾斜仪,以期捕捉地面上多振动等障碍而不易被人们发觉的微小变化。作为预测直下型地震的重要手段,测地学审议会和地震预知连络会再三催促开钻用以观测地震的深井。4月底完成钻井工程以后,紧接着就
According to Japan’s “Asahi Shimbun” reported on March 9, 1977, in order to explore the direct earthquake hit the metropolitan area, the National Disaster Prevention Science and Technology Center opened a deep well in Shonan-machi, Chiba to observe earthquakes. Wells at a depth of 2,500 meters, ready to install high-sensitivity seismographs and inclinometers, in order to capture the ground on the multi-vibration and other minor obstacles not easily detectable changes. As an important means of predicting direct-type earthquakes, the Geodesy Council and the Earthquake Prediction Association repeatedly urged the drilling of deep wells for observing earthquakes. After completing the drilling project by the end of April, follow-up