NEAR-FIELD GROUND MOTION INTENSITY ESTIMATED FROM DAMAGE DISTRIBUTION OF WOODEN HOUSES DURING THE 1948 FUKUI EARTHQUAKE

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  • NOBATA Arihide
    Obayashi Corporation Technical Research Institute
  • MIDORIKAWA Saburoh
    Dept. of Built Environment, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology

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  • 木造家屋の被害分布より推定した1948年福井地震の震源近傍における地震動強さ
  • モクゾウ カオク ノ ヒガイ ブンプ ヨリ スイテイ シタ 1948ネン フクイ ジシン ノ シンゲン キンボウ ニ オケル ジシンドウ ツヨサ

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Abstract

Evaluation of near-field ground motion is one of the most important issues in the seismic design. In this study, the ground motion intensity of the 1948 Fukui earthquake which is one of the most disastrous in-land shallow earthquakes is investigated, in order to make a better understanding of the characteristic of the near-field ground motion. First, the fragility curve of collapse of wooden houses is built based on the intensity of ground motion estimated from the damage data and the re-evaluated collapse rate of houses. And, the distribution map of ground motion intensity during the 1948 Fukui earthquake is obtained by using this fragility curve. As the result, the estimated peak ground velocity is more than 120cm/s in the central Fukui plane, and partially it exceeds 200cm/s.

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