ローム台地のS波速度構造と地盤震動特性：栃木県宇都宮地域を例に
一般に地盤が良いとされるローム台地において，ローム層が地盤震動特性に与える影響を知るために，栃木県宇都宮地域で段丘面ごとに微動アレイ観測を行った．その結果，調査地域の段丘を覆うローム層はS波速度が130～150m/sと低いこと，また古い段丘ほどローム層が厚いために深度30mまでの平均S波速度は低く，H/Vスペクトルのピーク周波数も低周波側にシフトすることが明らかになった．一方で，鬼怒川や五行川などの河床は主に礫質堆積物からなりローム層を欠くため，河川沿いの低地では平均S波速度は高く，H/Vスペクトルでは高周波にピークがみられた．つまり調査地域では，低地面や低位の段丘ほど堅固な地盤であり，高位の...
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| Published in | 地質学雑誌 Vol. 126; no. 6; pp. 311 - 326 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | Japanese |
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一般社団法人 日本地質学会
15.06.2020
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| Online Access | Get full text |
| ISSN | 0016-7630 1349-9963 |
| DOI | 10.5575/geosoc.2020.0012 |
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| Abstract | 一般に地盤が良いとされるローム台地において，ローム層が地盤震動特性に与える影響を知るために，栃木県宇都宮地域で段丘面ごとに微動アレイ観測を行った．その結果，調査地域の段丘を覆うローム層はS波速度が130～150m/sと低いこと，また古い段丘ほどローム層が厚いために深度30mまでの平均S波速度は低く，H/Vスペクトルのピーク周波数も低周波側にシフトすることが明らかになった．一方で，鬼怒川や五行川などの河床は主に礫質堆積物からなりローム層を欠くため，河川沿いの低地では平均S波速度は高く，H/Vスペクトルでは高周波にピークがみられた．つまり調査地域では，低地面や低位の段丘ほど堅固な地盤であり，高位の段丘ほどローム層が厚く，軟らかい地盤であるといえる．高位の段丘では，地震の際にやや低周波の揺れが大きく増幅される可能性がある． |
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| AbstractList | 一般に地盤が良いとされるローム台地において，ローム層が地盤震動特性に与える影響を知るために，栃木県宇都宮地域で段丘面ごとに微動アレイ観測を行った．その結果，調査地域の段丘を覆うローム層はS波速度が130～150m/sと低いこと，また古い段丘ほどローム層が厚いために深度30mまでの平均S波速度は低く，H/Vスペクトルのピーク周波数も低周波側にシフトすることが明らかになった．一方で，鬼怒川や五行川などの河床は主に礫質堆積物からなりローム層を欠くため，河川沿いの低地では平均S波速度は高く，H/Vスペクトルでは高周波にピークがみられた．つまり調査地域では，低地面や低位の段丘ほど堅固な地盤であり，高位の段丘ほどローム層が厚く，軟らかい地盤であるといえる．高位の段丘では，地震の際にやや低周波の揺れが大きく増幅される可能性がある． |
| Author | 長, 郁夫 坂田, 健太郎 中澤, 努 |
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| Copyright | 2020 日本地質学会 |
| Copyright_xml | – notice: 2020 日本地質学会 |
| DOI | 10.5575/geosoc.2020.0012 |
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| SubjectTerms | ground motion characteristics Kanto Plain loam terrace microtremor array observation Pleistocene S-wave velocity structure Tochigi Prefecture Utsunomiya volcanic ash soil |
| Title | ローム台地のS波速度構造と地盤震動特性：栃木県宇都宮地域を例に |
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