掲載雑誌（和）：
日本地震工学シンポジウム論文集
Vol：
9-3巻
年：
1994年
頁：
E.121-E.126頁
著者（和）：
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タイトル（和）：
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抄録（和）：
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キーワード（和）：
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掲載雑誌（英）：
PROCEEDINGS OF THE JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM
著者（英）：
Masahiro IIDA, Mario ORDAZ, Hitoshi TANIGUCHI, Carlos GUTIERREZ, Miguel SANTOYO
タイトル（英）：
INTERPRETATION OF WAVE FIELD INSIDE THE MEXICO VALLEY ON THE BASIS OF BOREHOLE DATA
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抄録（英）：
During the 1985 Michoacan earthquake (Ms=8.1), seismic waves were amazingly amplified in the lakebed zone of Mexico City, which is approximately 400 km from the epicenter, and the long duration of the lakebed seismograms was a real surprise. In the present study, we hypothesize that the long coda is not only surface waves, but also long-period body waves, which are produced by the multipathing due to the long-distance path and the very soft surficial layers. We perform the nonstationary spectrum analysis, the 1-D elastic propagation analysis and the cross correlation analysis for borehole data at lakebed stations. These analyses indicate that the soft surficial layers afford to cause dominant-period waves, and that the long-duration records are composed of both surface waves and long-period body waves.
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委員会論文集