日本地震工学会論文集
Online ISSN : 1884-6246
ISSN-L : 1884-6246
18 巻 , 3 号
英文号
選択された号の論文の10件中1~10を表示しています
論文
報告
  • - REPORT ON FIELD INVESTIGATIONS IN HOKKAIDO -
    Takuya EGAWA, Takahiro YAMANASHI, Koichi TOMISAWA
    2018 年 18 巻 3 号 p. 3_104-3_118
    発行日: 2018年
    公開日: 2018/06/28
    ジャーナル フリー

    In the conventional design method, there is no particular method to judge the liquefaction phenomenon of the unusual soil such as volcanic ash soil. This study, in order to clarify and evaluate the liquefaction characteristics of volcanic ash soil, field investigations and a series of soil laboratory tests of volcanic ash ground were carried out. The field investigations and sampling were conducted in the areas where ground liquefaction occurred due to the 1993 Hokkaido-nansei-oki and the 2013 Tokachi-oki earthquakes. According to the results, the liquefaction strength ratio (RL) was underestimated when using the formulation of the conventional design method. Moreover, it was found that the estimated formulation RL need to be modified for evaluating the liquefaction phenomenon in volcanic ash soil.

  • Michihiro OHORI, Yuta ASAKA, Hiroki AZUMA, Shigeki ADACHI, Masaki ITO, ...
    2018 年 18 巻 3 号 p. 3_119-3_130
    発行日: 2018年
    公開日: 2018/06/28
    ジャーナル フリー

    The eighth meeting of the Microtremor Research Camp (MRC) was held in Ohno City, Fukui Prefecture from September 30th to October 2nd in 2016, and MRC carried out microtremor measurements in the Katsuyama Basin, which is constituted by deposits of the Kuzuryu River. These measurements consist of microarray measurements at 25 sites and single-point measurements at 67 sites. This paper reports the outline of these measurements and presents the distribution of predominant frequencies in the basin obtained by the analysis of horizontal-to-vertical spectrum ratio at single-point measurement sites. As a result, the large differences in the distribution of predominant frequencies and peak spectral amplitudes between the Quaternary terrace deposits and alluvial deposits are clarified.

feedback
Top