1999 Fiscal Year Final Research Report Summary
Research on Dynamics of Earth's Deep Interior by Employing a Superconducting Gravimeter Network in Northern and Southern Hemispheres
| Project/Area Number |
09440158
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体地球物理学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
TAKEMOTO Shuzo Kyoto University, Graduate School of Science, Department of Geophysics, Professor, 大学院・理学研究科, 教授 (40027256)
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| Co-Investigator(Kenkyū-buntansha) |
HIGASHI Tosihiro Kyoto Univ., Dep. of Geophys., Instructor, 大学院・理学研究科, 助手 (90135517)
FUJIMORI Kunio Kyoto Univ., Dep. of Geophys., Lecturer, 大学院・理学研究科, 講師 (00025470)
FUKUDA Yoichi Kyoto Univ., Dep. of Geophys., Associate Professor, 大学院・理学研究科, 助教授 (30133854)
ONOUE Kensuke Kyoto University, Disaster Prevention Research Institute, Instructor, 防災研究所, 助手 (10027261)
SUDO Yasuaki Kyoto Univ., Institute for Geothermal Sciences, Associate Professor, 大学院・理学研究科, 助教授 (40025466)
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| Project Period (FY) |
1997 – 1999
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| Keywords | Gravimeter / superconducting gravimeter / gravity changes / Core-under-tone / fluid core / ocean tides / Dynamics of Earth's deep interior / polar motion |
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| Research Abstract |
Precise gravity measurements using superconducting gravimeters (SGs) are expected to be an effective measure for detection of very weak signals caused by oscillations in the Earth's fluid core, or long-term gravity changes due to regional tectonic movements. A global network of SGs was set up by Global Geodynamic Project (GGP), an international program of observations of temporal variations in the Earth's gravity field, under the sponsorship of IUGG and IAG. Data distribution of the network began in 1997. With regard to the global network of SGs, our research group has contributed to extend the network in northern and southern hemispheres. Nowadays, we have carried on SG observations in Esashi, Matsushiro, Kyoto, Aso, Syowa (Antarctica), Canberra (Australia), Bandung (Indoesia) and Ny-Alesund (Norway). During recent three years, we observed fluid core resonance in diurnal tidal bands, long-period gravity changes related to the polar motion, as well as incessant excitation of the Earth's free oscillations. Furthermore, simultaneous observations of SGs and FG-5 Absolute Gravimeters detected the loading effects of ocean tides.
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