39. マイクロゾーニングにおける微動活用法の検討 : その3 地形形成史から見た未固結層厚と卓越周期の関係

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  • 39. Investigation on Practical Use of Microtremor Observations for Microzoning : Part 3 Relationship between unconsolidated soil depth and Predominant Period considering History of Landform Development

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Microtremors measurement is a very useful method for obtaining ground dynamic characteristics, including the predominant period and the site amplification factor. In this survey the spatial distribution of the microtremor's predominant period was mapped over geological data in a GIS base system. So that H/V spectral ratios of microtremors were obtained in the Yokohama City. Relationship between their predominant periods and the total thickness of the latest Pleistcene and Holocene deposits was explained by the regression equation Y=A*X+B. This result brings us that more effective use of microtremor observations is possible for seismic microzoning. In this study, it aims to be able to use microtrmor observations further more effectively to use it for high reliable seismic microzoning.

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