2004 Fiscal Year Final Research Report Summary
Studies on global gravity changes by means of absolute gravity measurements at the GGP-JAPAN superconducting gravity stations.
| Project/Area Number |
14340132
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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 |
FUKUDA Yoichi Kyoto University, Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (30133854)
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| Co-Investigator(Kenkyū-buntansha) |
TAKEMOTO Shuzo Kyoto University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (40027256)
HIGASHI Toshihiro Kyoto University, Graduate School of Science, Assistant Professor, 大学院・理学研究科, 助手 (90135517)
SATO Tadahiro National Astronomical Observatory, Associate Professor, 地球回転系, 助教授 (10000176)
IMANISHI Yuichi University of Tokyo, Ocean Research Institute, Assistant Professor, 海洋研究所, 助手 (30260516)
DOI Koishiro Polar Research Institute, Associate Professor, 南極圏環境モニタリング研究センター, 助教授 (80290873)
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| Project Period (FY) |
2002 – 2004
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| Keywords | Absolute Gravimeter / Superconducting Gravimeter / GGP / Gravity Changes / Satellite Gravimetry / Gravity Base Station |
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| Research Abstract |
The goal of this study is to determine calibration factors of superconducting gravimeters of the GGP(Global Geodynamic project)-Japan stations, and to obtain precise gravity data sets, which can be used for the comparison with the satellite gravity data such as GRACE, by means of absolute gravity measurements.
For this purpose, we conducted absolute gravity measurements by our own hand at the GGP-Japan sites of Bandung (Indonesia) in 2002, Syowa Station (Antarctica) in 2003 and Canberra (Australia) in 2004, in addition to the GGP-Japan domestic sites of Kyoto, Esashi and Matsushiro. Absolute gravity measurements at Ny-Alesund, the other GGP-Japan site in Arctic area, were also conducted in cooperation with European researchers. Moreover, we conducted additional absolute measurements in Yogyakarta and Tibinon (Indonesia), and in Perth (Australia) for future references of secular gravity changes.
As the results of this study, besides the originally intended outcome, namely the determination of the calibration factors of the superconducting gravimeters at the GGP-Japan sites, we established several absolute gravity stations for detecting future gravity changes. Especially the absolute gravity measurement conducted by this research was the first one in the history of Indonesia, and it also played a big role to enhance the gravity reference network in Indonesia.
On the other hand, from the viewpoint of the secular gravity changes, we detected the gravity change expected from the postglacial rebound in Syowa Station, and we also succeeded in detecting the gravity change associated with present day ice melting in Ny-Alesund.
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Research Products
(11 results)
