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タイトル: An Investigation into the Nature of Microtremors
その他のタイトル: 常時微動について
著者: Allam, Ahmed
Shima, Etsuzo
著者(別言語): Allam, Ahmed
嶋, 悦三
発行日: 1967年6月15日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第45冊第1号, 1967.6.15, pp. 43-59
抄録: 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.
URI: http://hdl.handle.net/2261/12322
ISSN: 00408972


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