| 講演要旨(和文) | | 当社で新たに開発された「無線式3成分データ収録システム」について，装置の有効性を確認するための常時微動計測を実施した．得られた微動波形についてスペクトル解析を行い，H/Vスペクトル比とともに卓越周波数の評価を行った．得られた結果は，次の通りである．(1)ほとんどの計測地点で3Hz以上の卓越周波数が示され，工学的基盤面は地中浅部の砂礫もしくは凝灰岩上部にあると考えられるが，1〜2Hzに二次的なピークを示す計測地点があり，さらに深部の層境界の存在が推察される．(2)(1)から，当社が開発した無線式3成分データ収録システムの有効性が確認された．(3)150m以浅のS波速度構造モデルについて妥当なものが得られた． |
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| | 講演要旨(英文) | | In order to verify the effectiveness of the wireless data acquisition system consists of three components, we carried out microtremor measurements in 16 sites. We evaluated the dominant frequency of the H/V spectral ratio obtained by spectral analysis. The results we have obtained in this study are as follows. (1) For most sites, the dominant frequency is more than 3Hz, and we have considered that there is an engineering seismic base layer in shallow underground. However, because there is a sub peak between 1 and 2Hz, we have speculated that there is an S-wave velocity boundary deeper than the base layer. (2) From the above, we have been able to verify the effectiveness of the system developed by our company. (3) We have obtained the S-wave velocity model that satisfies the transfer function in a more shallow part 150m. |
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