Strain Measurement by Double Coaxial Borehole Strainmeters at Odawara, Japan.
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Accession number;01A0565403
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| Title;Strain Measurement by Double Coaxial Borehole Strainmeters at Odawara, Japan. |
| Author;
YOSHIKAWA S
(Meteorological Res. Inst., Ibaraki-ken, Jpn)
YAMAMOTO T
(Meteorological Res. Inst., Ibaraki-ken, Jpn)
KAMIGAICHI O
(Japan Meteorological Agency, Tokyo, Jpn)
NAITO H
(Sapporo District Meteorological Observatory, Hokkaido, Jpn)
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Journal Title;Journal of the Geodetic Society of Japan
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Journal Code:G0199A
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ISSN:0038-0830
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VOL.47;NO.1;PAGE.128-133(2001)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;English |
| Abstract;The strain records of the Double Coaxial Borehole Strainmeters(DCBS) installed at Odawara, Japan, were analyzed by focusing on the difference in the behaviors of the upper and lower sensors. In Stage I(1989-1995), the behavior was characterized by strain steps and irregular changes with small correlation between the two sensors. In Stage II(1996-1998), the long-term trends showed quite different behaviors with each other. Since steady contraction seen in the lower sensor resembled to the record of adjacent Borehole Strainmeter station at Yugawara, the lower sensor seemed to be stabilized in this period. In Stage III(1999-), behaviors of the two sensors became almost similar. Clear temporal changes corresponding to each stage could not be found both in the responses to the earth- and oceanic tide and the atmospheric pressure. FEM analysis suggested that the responses are strongly affected by the mechanical properties of the surrounding rocks. The recent trends in DCBS may reflect the regional stress state around the Odawara station. (author abst.) |
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