地殻傾斜観測資料集(3)1980 : 近又・野田沢・岡部・中伊豆・南足柄・塩山・岩井北・銚子・韮山地殻活動観測施設

概要

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The National Research Center for Disaster Prevention is conducting crustal tilt observation in the Kanto-Tokai area by using the borehole-type tiltmeters. The tiltmeter is installed at the bottom of each observation well. The output voltage, which is proportional to the ground tilting, is transmitted to the Research Center at Tsukuba, Ibaraki Prefecture, by the telemetry system and recorded on magnetic tapes by a digital data recorder. In 1980, observation was started at three new stations in addition to the six stations where stationary observation had been carried out since 1978. We report changes of the crustal tilt at the nine stations during 1980. The results are illustrated in two different types of diagrams : monthly diagrams where tilt data are plotted every hour, and annual diagrams where daily mean of tilt is plotted in order to show gross features of the tilt changes.
1981-07-06