日本建築学会構造系論文集
Online ISSN : 1881-8153
Print ISSN : 1340-4202
ISSN-L : 1340-4202
傾斜基盤構造推定における微動H/Vスペクトルの頑健性とそれを用いた大阪平野南部域の盆地構造モデルの改良
上林 宏敏川辺 秀憲釜江 克宏宮腰 研堀家 正則
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2009 年 74 巻 642 号 p. 1453-1460

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The two microtremor features, namely, the H/V spectra and the dispersion curves, on the basin periphery area were investigated to the southern Osaka basin. In the coastal area with a gentle basement inclination, the S-wave velocity profile identified from the two features gave the appropriate basement depth. On the other hand, in the terrace area with a steep basement inclination, the S-wave velocity profile identified from the dispersion curves was quite different from the one obtained from the down-hole S-wave logging. As the reason of the experimental results, it could be interpreted that microtremor H/V spectra are likely to be robuster than microtremor dispersion curves in the estimation of the subsurface structures with an inclined basin-bedrock interface. On the basis of this usefulness of microtremor H/V spectra, the past basin model in southern part in Osaka plains was improved using three-component microtremor records observed at a hundred stations. The depth of the basin-bedrock interface of the presented model was deeper in the coastal area and shallower in the terrace area than that of the past model.

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© 2009 日本建築学会
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