Tidal Strains Observed with Extensometers in Donzurubo Observatory, Nara, Japan.
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Accession number;01A0565405
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| Title;Tidal Strains Observed with Extensometers in Donzurubo Observatory, Nara, Japan. |
| Author;
ONOUE K
(Kyoto Univ., Nara, Jpn)
MUKAI A
(Nara Sangyo Univ., Nara, Jpn)
TAKEMOTO S
(Kyoto Univ., Kyoto, 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.141-147(2001)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;English |
| Abstract;We have carried on observations of ground-strains and -tilts at Donzurubo Observatory, Nara, Japan since 1968. In order to investigate the local effect on tidal strain observations, we analyzed strain data obtained from three extensometers in Donzurubo during one year in 1999 by employing the Bayesian Tidal Analysis Program 'BAYTAP-G' and compared observational results with theoretical tidal strains calculated by 'GOTIC2' Program. As a result, observed tidal strains of the SE-2 component(N4.5.DEG.E) are well consistent with theoretical tidal strains. However, tidal strains observed with the SE-1 component(E4.5.DEG.S) show extremely small amplitudes compared with theoretically expected ones, i.e. about one fourth of theoretically expected ones. Tidal strain amplitudes observed with the SE-3 component(N40.5.DEG.W) are 50-60% of theoretically expected ones and maximum phase lag with this component is about 30 degrees for O1 constituent. We consider that the apparent amplitude reduction of tidal strains of SE-1 is mainly caused by the effects of anisotropy of the geological structure and the configuration of the mountain with a ridge and some part may be reflecting the topographic effect. (author abst.) |
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