| Project/Area Number |
07558056
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Natural disaster science
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| Research Institution | University of Tokyo |
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Principal Investigator |
KUDO Kazuyoshi Earthquake Research Institute, University of Tokyo, Assoc.Prof., 地震研究室, 助教授 (50012935)
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| Co-Investigator(Kenkyū-buntansha) |
IWATA Tomotaka Disaster Prevention Research Institute, Kyoto Univeristy, Research Associate, 防災研究室, 助手 (80211762)
MORITA Yuichi Earthquake Research Institute, University of Tokyo, Assoc.Prof., 助教授 (30220073)
SASATANI Tsutomu Graduate School of Science, University of Hokkaido, Assoc.Prof., 大学院理学研究課, 助教授 (10002148)
IRIKURA Kojiro Disaster Prevention Research Institute, Kyoto Univeristy, Prof., 防災研究所, 教授 (10027253)
MINAMI Sadao Earthquake Research Institute, University of Tokyo, Prof., 教授 (10012923)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥18,400,000 (Direct Cost: ¥18,400,000)
Fiscal Year 1997: ¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 1996: ¥10,200,000 (Direct Cost: ¥10,200,000)
Fiscal Year 1995: ¥5,500,000 (Direct Cost: ¥5,500,000)
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| Keywords | mobil observation / portable strong motion instrument / array observation / wide-band, high-dynamic range / propagation of strong motion / surface geology / 軽量小型強震計 / 広帯域高ダイナミックレンジ / 強震動伝播 / 地震破壊過程 / 強震伝播 |
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| Research Abstract |
This study focused on manufacturing portable strong motion observation instruments and developing array observation methods, certifying a easy mobile observation just after a large earthquake occurrence and/or in case of emergency. In the first year of this project, we compared the features of exiting instruments, surveyed the possible new specifications of instruments and manufactured a sensor and a data logger as a trial. Next year, we examined the trials obtaining the results from several tests and determined finally the specifications for new instruments. A moving-coil type accelerometer was selected as a sensor, because it require no power supply. The principal specifications of the sensor are that it is observable from microtremors level until very strong one like the Kobe cases (150cm/s) and it has a flat response from 0.07Hz to 100Hz. The data logger used 24 bits A/D converter achieved a dynamic ange of 130 dB and it needs less power supply. The total weight of the new instrument without battery is 3 kg. In the third year, we examined the new instruments in the field for array observation of earthquake as well as microtremors, not only in Japan but also in U.S.A.and Greece. It was confirmed through the various field tests that the new instruments were very useful for mobile array observations.
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