| Project/Area Number |
10041116
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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 Geoysics, Proffesor, 大学院・理学研究科, 教授 (40027256)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Tadahiro National Astronomical Observatory, Mizusawa, Associate Professor, 地球回転研究系, 助教授 (10000176)
HIGASHI Tosihiro Kyoto Univ., Dep. of Geophys., Instructor, 大学院・理学研究科, 助手 (90135517)
FUKUDA Yoichi Kyoto Univ., Dep. of Geophys, Associate Professor, 大学院・理学研究科, 助教授 (30133854)
IMANISHI Yuichi Univ. of Tokyo, Ocean Res. Inst. Instructor, 海洋研究所, 助手 (30260516)
TAMURA Yoshiaki National Astronomical Observatory, Mizusawa, Instructor, 地球回転研究系, 助手 (90150002)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥4,800,000 (Direct Cost: ¥4,800,000)
Fiscal Year 1999: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1998: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | superconducting gravimeters / absolute gravimeters / Earth tides / ocean tides / Indonesia / China / island arc / structure of upper mantle |
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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 tectonic motions related to seismic and volcanic activities. 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. It is of course important to improve global geodynamic studies focused on Earth's deep interior using data of the SG global network. On the other hand, it is desired to investigate regional characteristics of physical properties and structures in crust and upper mantle in East Asia using SG data in Indonesia, China and Japan by means of comparison of loading effects of ocean tides on Earth tide observation in these areas. Kyoto University has carried on
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precise gravity observation using two SGs since 1988. In 1997, we shifted one of the two GSs from Kyoto to Bandung, Indonesia. Since then, SG observation in Bandung has been continued under close cooperation between Kyoto Univ. and Volcanological Survey of Indonesia. In this study, we, Japanese investigators visited Bandung every half a year for maintenance of the SG, and Indonesian investigators visited Kyoto every year to analyze the SG data and to discuss problems on gravity changes in tectonically active regions along island arcs. The head investigator (S. Takemoto) visited the Institute of Geodesy and Geophysics, Chinese Acad. Sci. in Wuhan in November 1999 and discussed with Chinese investigators our cooperative research of geodynamics in East Asia using superconducting gravimeters and absolute gravimeters. We could establish a data set of the superconducting gravimeters in Bandung, Wuhan and Kyoto. As a result of comparison of these data, regional difference of loading effects of ocean tides on Earth tide observation can be indicated. Less
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