A DEFINITION FOR DURATION OF EARTHQUAKE GROUND MOTION BY PHASE DIFFERENCES AND ITS STATISTICAL ANALYSIS

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  • 位相差分による地震動継続時間の定義とその統計解析
  • イソウ サブン ニ ヨル ジシンドウ ケイゾク ジカン ノ テイギ ト ソノ

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In this study, a duration of earthquake ground motion was defined by the standard deviation of relative frequency distribution of Fourier phase differences. It was examined from comparison of the motions on surface ground with ones on base rock how the duration was influenced by soil condition. Then, the regression analysis was carried out to investigate the dependence of the duration to magnitude, epicentral distance and difference of datasets. It was concluded that present duration was not influenced by soil condition so much and the duration of motion on surface ground was equivalent to that of base rock. The difference of datasets had a large influence to the results of regression analysis for the duration, so the attention should be paid when a statistical analysis was carried out.

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