| Co-Investigator(Kenkyū-buntansha) |
FUKUDA Yoichi Koto Univ., Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (30133854)
HIGASHI Toshihiro Kyoto Univ., Graduate School of Science, Instructor, 大学院・理学研究科, 助手 (90135517)
SUDO Yasuaki Kyoto Univ., Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (40025466)
IMANISHI Yuichi Univ. of Tokyo, Ocean Research Institute, Instructor, 海洋研究所, 助手 (30260516)
SATO Tadahiro National Astronomical Observatory, Professor, 地球回転研究系, 教授 (10000176)
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| Research Abstract |
Taking part in the Asia-Pacific Space Geodynamics (APSG) Project cooperation campaigns in IAG and the work plan in the Permanent Committee on GIS Infrastructure for Asia & the Pacific (PCGIAP), we have collaborated to establish the Absolute Gravity Standard Station Network in East Asia and South-East Asia (AGSSN-ESEA) with FG-5 absolute gravimeters. During the period from 2002 to 2005, we have already determined absolute gravity values in the order of μGal at Wuhan, Nanning, Shanghai, Beijing, Kunming, Lhasa, Hong-Kong Wulumuqi, Xi'an and Xining in China, Hsinchu in Taiwan, Bandung, Yogyakarta Cibinong and Pontianak in Indonesia, Kuala Lumpur and Kota Kinabalu in Malaysia, Bangkok and Cheng-Mai in Thailand, and Manila in Philippines as well as Kyoto, Esashi, Matsushiro, Kamioka, Muroto, Aso, Mizunami and Naha in Japan. In this campaign, we performed first AG measurements in Indonesia, Malaysia and Philippines and contributed to establish national gravity standards in these countries. As an extension of this campaign in the southern hemisphere, we have conducted absolute gravity measurements in Perth and Canberra in Australia, and the Syowa Station in Antarctica in 2003-2004.
As a result of comparison of AG values obtained from different FG-5 meters in Wuhan, Beijing, Hong Kong, Hsinchu and Kyoto, it was revealed that difference in measured values depending on each instrument is 11μGal at the most. In Wuhan, Bandung, Kyoto, Esashi, Matsushiro and Kamioka, we have determined SG calibration factors within the accuracy of the order of 0.1% from inter-comparison of SG and AG meters.
We are expecting that relative vertical movements between the continent and island arc can be detected in the order of 1cm by the repeated AG measurements at stations in AGSSN-ESEA at interval of 5 to 10 years.
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