Item Description
長周期地震動は時として長大構造物に深刻な影響を及ぼす。地震動は、地盤構造に依存するいわゆるサイト特性が大きく関係するため、特にS波速度構造物の詳細な把握は重要課題の一つとなっている。本研究では、千葉市を対象に、多数の地震計を用いたアレイ観測および美容アレイ観測により、主として深部の地盤構造を明らかにすることを目的としている。
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44.655983, 0.61829899999998
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44.655983
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0.6182989999999791
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44.655983,0.6182989999999791
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KH
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KH
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Japanese Title
日本地震工学会論文集｜Vol.12 (2012) No. 4｜地震計アレイを用いた千葉市における深部地盤構造の推定 [PDF]
Japanese Description
長周期地震動は時として長大構造物に深刻な影響を及ぼす。地震動は、地盤構造に依存するいわゆるサイト特性が大きく関係するため、特にS波速度構造物の詳細な把握は重要課題の一つとなっている。本研究では、千葉市を対象に、多数の地震計を用いたアレイ観測および美容アレイ観測により、主として深部の地盤構造を明らかにすることを目的としている。
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frequency | Once | scope | Page | email | | language | Japanese| | translation | A long period ground motion during an earthquake sometimes has a serious impact on large structures. Since the
ground motion during an earthquake is largely affected by the so-called site effect which is determined by the soil
structure, it is important to obtain its profile, especially the shear wave velocity profile. In this study, an attempt
has been made to estimate an shear wave velocity profile by seismometer array measurements during the 2011
Tohoku earthquake and its after shocks in addition to the earthquakes prior to it, in which Chiba City was chosen
as a target area. The result was compared with that of microtremor measurement and the existing profile for deep
soils. It was found from the study that the phase velocity dispersion curve obtained from earthquake observations
overlaps smoothly with that from microtremor measurements. It was also found that, although the estimated soil
profile has a fairly good agreement with the previously reported ones, there is a possibility of a slight
underestimation of the previously reported ones when compared to our result.
ground motion during an earthquake is largely affected by the so-called site effect which is determined by the soil
structure, it is important to obtain its profile, especially the shear wave velocity profile. In this study, an attempt
has been made to estimate an shear wave velocity profile by seismometer array measurements during the 2011
Tohoku earthquake and its after shocks in addition to the earthquakes prior to it, in which Chiba City was chosen
as a target area. The result was compared with that of microtremor measurement and the existing profile for deep
soils. It was found from the study that the phase velocity dispersion curve obtained from earthquake observations
overlaps smoothly with that from microtremor measurements. It was also found that, although the estimated soil
profile has a fairly good agreement with the previously reported ones, there is a possibility of a slight
underestimation of the previously reported ones when compared to our result.
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http://wayback.archive-it.org/2438/20110301000000/https://www.jstage.jst.go.jp/article/jaee/12/4/12_4_80/_pdf
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https://www.jstage.jst.go.jp/article/jaee/12/4/12_4_80/_pdf