1988 Fiscal Year Final Research Report Summary
Study on development of a small three components borehole strain meter
| Project/Area Number |
61840011
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
固体地球物理学
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| Research Institution | University of Tokyo |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
KATO Teruyuki Earthquake Research Institute, University of Tokyo, RESEARCH (80134633)
YANAGISAWA Michio Earthquake Research Institute, University of Tokyo, RESEARCH (90012947)
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| Project Period (FY) |
1986 – 1988
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| Keywords | a small borehole strainmeter / 小型3成分ひずみ計 / 感度検定 |
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| Research Abstract |
In order to collect data to make a small borehole three components strainmeter with a diameter of 6 cm and a length of 20 cm, various experiments were performed. Firstly a small borehole vessel made from brass was produced and a semiconductor strain gage was employed as a sensor. After various experiments like water proof and sensitivity the strain meter was set into a borehole in the tunnel of Nokogiriyama crustal movement observatory. It was found that the strain meter had a enough sensitivity to record earth tide. Drift and noise of the meter were also investigated. Secondly, a three components strainmeter was produced and it was installed in a water in the vault of Aburatsubo crustal movement observatory. A drift, sensitivity, temperature effect and so on were tested for various sensors like strain gate, magnesensor and eddy current sensor and basic data to produce practical small three components borehole strain meter.
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