| Project/Area Number |
07041111
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Field Research |
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| Research Institution | TOKYO METROPOLITAN UNIVERSITY |
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Principal Investigator |
MOCHIZUKI Toshio Center for Urban Studies, Tokyo Metropolitan University, Professor, 都市研究所, 教授 (80087270)
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| Co-Investigator(Kenkyū-buntansha) |
CARLOS Gutie メキシコ国立防災センター, 研究員
MARIO Ordaz メキシコ国立防災センター, 主任研究員
ROBERTO Quaa メキシコ国立防災センター, 主任研究員
IIDA Masahiro Earthquake Research Institute, University of Tokyo, 地震研究所, 助手 (50159563)
TANIGUCHI Hitoshi Center for Regional Development, United Nations, 研究員 (20121361)
MASAKI Kazuaki Aichi Institute of Technology, 工学部, 教授 (90078915)
QUAAS Roberto Natural Disaster Prevention Center, Mexico
GUTIERREZ Carlos Natural Disaster Prevention Center, Mexico
ORDAZ Mario Natural Disaster Prevention Center, Mexico
GUTIERREZ Ca メキシコ国立防炎センター, 研究員
ORDAZ Mario メキシコ国立防炎センター, 主任研究員
QUAAS Robert メキシコ国立防炎センター, 主任研究員
QUTIERREZ Ca メキシコ国立防災センター, 研究員
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥6,900,000 (Direct Cost: ¥6,900,000)
Fiscal Year 1996: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1995: ¥3,100,000 (Direct Cost: ¥3,100,000)
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| Keywords | Strong-motion database / Long path / Wavefield of Mexico Valley / Very soft ground / Microtremor measurement / Seismic risk evaluation system / Soil-structure interaction |
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| Research Abstract |
The 19 September 1985 Hichoacan earthquake (Hs=8.1) caused very severe damage in Mexico City inside the Mexico Valley, which is approximately 400 km from the epicenter in the Pacific Ocean. Whereas the earthquake produced very low accelerations at epicentral stations, seismic waves were amazingly amplified inside the valley, especially in the lakebed zone, and the long duration of the lakebed seismograms was a real surprise. We hypothesize that the long coda in the lakebed zone are produced by multipathing due to the long-distance path and the vibration characteristics, which depend on the valley configuration and the very soft surficial layrs. The following 3 study subjects have been performed. The first subject is the interpretation of wave field in the Mexico City and is composed of 4 topics. The first topic is the construction of database software for strong-motion records. The second topic is the estimation of the long-path effects by basic analysis of strong-motion records along the long path. The third topic is the analysis of array records in Mexico City. The fourth topic is the microtremor measurements along the long path to examine site effects of strong-motion stations. The second subject is the development of general seismic risk evaluation system for Mexico City. Thirdly, we estimate the response of structures on the soft ground of Mexico City, considering soil-structure interaction.
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