孔井用傾斜計による地殻傾斜観測方式の開発

DOI Web Site Web Site 被引用文献7件

書誌事項

タイトル別名
  • Development of the Crustal Tilt Observation Method Using Borehole-type Tiltmeters
  • コウセイヨウ ケイシャケイ ニヨル チカク ケイシャ カンソク ホウシキ ノ
公開日
1980
DOI
  • 10.4294/zisin1948.33.3_343
公開者
公益社団法人 日本地震学会

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説明

Continuous monitoring of the crustal tilt is one of the most effective approaches for the purpose of earthquake prediction. Drilling a borehole is not so expensive as construction of an underground vault, which is necessary for installation of water-tube tiltmeters and horizontal pendulum tiltmeters, and a borehole station is possible to be made even in a plain area. The National Research Center for Disaster Prevention has not only developed the boreholetype tiltmeter itself but has improved borehole drilling techniques and installation methods for the tiltmeter. The force-balanced pendulum tiltmeter developed for down-hole observation is installed at the bottom of the borehole of which the depth is about 100m. The measuring range is ±2×10-4 radian, the resolution is 6×10-9 radian, and the long term drift is smaller than a few micro-radian per year after half a year since the installation. Clear records of the earth tides demonstrate the high quality of the instrument. Tilt changes of the order of micro-radian caused by precipitation are remarkable in the data of some stations. But, the crustal tilt observation by using borehole-type tiltmeters is expected to be very effective for detecting anomalous tilt changes of the order of 5×10-8 radian per day with a time constant of several hours to several tens of days.

収録刊行物

  • 地震　第２輯

    地震　第２輯 33 (3), 343-368, 1980

    公益社団法人 日本地震学会

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