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An Investigation into the Nature of Microtremors
https://doi.org/10.15083/0000033514
https://doi.org/10.15083/00000335145436cc0b-64e6-4da7-ae23-7a90db0068fb
名前 / ファイル | ライセンス | アクション |
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ji0451005.pdf (678.4 kB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2008-05-30 | |||||
タイトル | ||||||
タイトル | An Investigation into the Nature of Microtremors | |||||
言語 | en | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15083/0000033514 | |||||
ID登録タイプ | JaLC | |||||
その他のタイトル | ||||||
その他のタイトル | 常時微動について | |||||
著者 |
Allam, Ahmed
× Allam, Ahmed× Shima, Etsuzo |
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著者別名 | ||||||
識別子 | 130909 | |||||
識別子Scheme | WEKO | |||||
姓名 | Allam, Ahmed | |||||
著者別名 | ||||||
識別子 | 130910 | |||||
識別子Scheme | WEKO | |||||
姓名 | 嶋, 悦三 | |||||
著者所属 | ||||||
著者所属 | Graduage School, University of Tokyo | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Many seismologists obtained different results concerning the nature of microtremors. Some proposed that they are mainly steady state body waves, and others suggested that they are mainly surface waves. To qualify each hypothesis the following steps were followed: 1. P- and S-wave information was obtained at Otaku in the Tokyo Metropolitan Area, from which the elastic constants, densities and underground structures were derived. 2. Microtremors were recorded at the same locations. The power spectral density functions were computed to determine the predominant frequency of the microtremors of each place. 3. The dispersion curves for Rayleigh and Love waves were derived to determine the frequencies of the minimum group velocities. 4. The spectral response was computed through the application of the multiple reflection phenomena to determine the predominant peak of the ground response. After proceeding through all of these steps, the predominant frequencies of the power spectral density functions of the microtremors were compared with the frequencies of the minimum group velocities of Rayleigh and Love waves. Also, they were compared with the predominant frequency of the spectral response of the ground. From these comparisons, we may conclude that the microtremors can be treated as steady state body waves and/or as surface waves with the same results at the places where the boundary of the subsoil and the basement is distinct. However, for a definite conclusion more detailed study along this line is inevitable. | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | 常時微動は,交通機関などの人工的震動源又は風などによる自然震動源により誘起された震動が四方八方から集って来たものと考えられている.したがって,常時微動は,これ等の波が伝播してくる途中の地盤の物理的性質に関する情報をたくさんふくんでいるに違いない.このような観点から,工学的な目的に積極的に常時微動を利用しようという研究が年々盛んになりつつある. | |||||
書誌情報 |
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo 巻 45, 号 1, p. 43-59, 発行日 1967-06-15 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 00408972 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AN00162258 | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf | |||||
日本十進分類法 | ||||||
主題 | 453 | |||||
主題Scheme | NDC | |||||
出版者 | ||||||
出版者 | 東京大学地震研究所 | |||||
出版者別名 | ||||||
Earthquake Research Institute, University of Tokyo |