日本地震工学会論文集
Online ISSN : 1884-6246
ISSN-L : 1884-6246
14 巻 , 6 号
英文号
選択された号の論文の8件中1~8を表示しています
論文
報告
  • Tomohiro KUBO, Yoshiaki HISADA, Koji AIZAWA, Kenji OMIYA, Shuto KOIZUM ...
    2014 年 14 巻 6 号 p. 6_118-6_141
    発行日: 2014年
    公開日: 2014/12/19
    ジャーナル フリー
    In the Great East Japan (Tohoku) Earthquake which occurred on March 11, 2011, strong ground motions were observed in an extensive area from the Tohoku regions to the Kanto region with unprecedentedly strong tremors felt at high-rise buildings located in the Tokyo metropolitan area. However, because the shaking of the earthquake observed in the Tokyo metropolitan area was smaller than the estimated scenario ground motions caused by earthquakes occurring directly beneath the area and the Tokai-Tonankai earthquake, those estimated earthquakes may cause major damages in the area. In order to reduce such damages, this report aims at outlining ground motions and damages of a high-rise building caused by the Great East Japan Earthquake, and at being of use in taking measures of seismic disasters. For this purpose, this report investigates a record of observation and damages caused on the day of the earthquake, a survey conducted after the earthquake with the focus on the high-rise building of the campus of Kogakuin University located in the Tokyo metropolitan area.
  • Yoshiaki HISADA, Tomohiro KUBO, Kei MATSUZAWA, Toshiaki MATSUMOTO, Aki ...
    2014 年 14 巻 6 号 p. 6_142-6_169
    発行日: 2014年
    公開日: 2014/12/19
    ジャーナル フリー
    We investigated the strong ground motions and the damage of buildings near the coseismic surface faulting of the 2011/04/11 Fukushima-ken-Hama-Dori Earthquake (the April 2011 Fukushima earthquake, Mw 6.6). First, we confirmed that the ground motions from this normal fault were equivalent and/or stronger than the thrust fault, by comparing the strong motion records with the attenuation relation. We also checked that the ground motions near the epicentral area were larger than those of the 2011/03/11 Great Tohoku earthquake (Mw 9.0). Therefore, the most of building damage was probably caused by the 2011 April Fukushima earthquake. Next, we investigated that the 191 buildings near the surface faulting (within 500 m), and obtained the following conclusions. The most of severe damage was caused by the surface faulting and the subsequent ground failure. Among 9 buildings above the surface faulting, only one building was overturned; the building was a traditional tall gate in a Budhism temple, and fell on the side by the surface faulting of about 60 cm dislocation, because the columns were not anchored to the foundations. As for the other buildings, the damage by the strong ground motion was negligible. That is, the rate of heavy damage (Damage Grade 4 and upper) was less than 2%, which corresponds to JMA Intensity 5- and 6+, even though the most of buildings seemed very old and weak.
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