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全文: "名古屋市立城北小学校"
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  • 坂尻 直巳
    地震 第2輯
    1983年 36 巻 3 号 466-469
    発行日: 1983/09/25
    公開日: 2010/03/11
    ジャーナル フリー
  • 鏡味 洋史, 堀田 淳, 太田 裕, 坂尻 直巳, 吉田 厚司, 田中 愛一郎, 久保寺 章
    地震 第2輯
    1983年 36 巻 4 号 609-617
    発行日: 1983/12/25
    公開日: 2010/03/11
    ジャーナル フリー
    A series of experimental studies of long-period microtremors has been continued with the intention of elucidating dynamic characteristics of deep ground soil during an earthquake and the stepwise results have been reported in the previous papers. Through those observations, we pointed out that the temporal variation of microtremors amplitude obviously correlates with that of sea waves and therefore further understanding of microtremors will be advanced by an investigation of sea wave characteristics.
    In this paper, using the date of simultaneous observation with sea waves, their relationship is discussed, and the following results are obtained. The temporal variations of both amplitudes of microtremors and sea waves are in clear correspondence. From the comparison of these spectra, it is concluded that the predominant period of microtremors is about a half of that of the sea waves. This fact enables us to insist that the Longuet-Higgins' theory is also applicable to the generation mechanism of the microtremors under consideration. Empirical equations connecting both of the spectral amplitudes of microtremors and of sea waves are newly derived.
    Generalizing these results, a revision of the standardized observation scheme proposed in the previous paper was made for the long-period microtremors.
  • 成瀬 聖慈, 吉田 厚司, 正木 和明, 鏡味 洋史, 宮崎 雅徳, 久保寺 章
    地震 第2輯
    1984年 37 巻 3 号 383-395
    発行日: 1984/09/25
    公開日: 2010/03/11
    ジャーナル フリー
    The research group for long-period microtremors has long been continuing a series of field observations in view of elucidating dynamic characteristics of deep soil deposit, and has demonstrated that the observation of long-period microtremors is a useful tool for solving this important problem in Earthquake Engineering. However, the research group is afraid such understanding might be produced owing to the fact that the observations were carried out mostly in a specific area of, say, Hachinohe city in northern Japan. To examine this, further observational experiments in the other areas are necessary. This paper reports such an examination.
    A new test field was chosen in and around the Nohbi plain, central Japan, knowing that there are wide-spread and deep-deposited alluvial soils. Another reason is the importance of this area from earthquake disaster prevention point. This area is, centered at Nagoya city, most extensive in industry and commerce and is located in seismically active region.
    The long-period microtremors were observed at 35 points at almost regular intervals of 2km along a N70E-S70W line passing through the Nohbi plain and extending to the outcrop sites of basemental Mesozoic rock. A systematic change of predominant periods of the microtremors was observed in terms of the Fourier spectra. It is between 1.5sec and 5sec, and seems correlated well with a depth to the basemental rock. The similar tendency in predominant periods was also supported by a supplimental observaton of natural earthquakes at several points on the soil and rock sites. A subsoil structure model along the observation line was proposed based upon the result that predominant period of the microtromors is a good index of soil layer thickness. Through this experiment it was reconfirmed that the observation of long-period microtremors provides much data effective for exploring amplification characteristic of deep soil deposit.
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