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The variations of the ground motion response spectra are examined by comparing pairs of ground motion records observed at the same site from two earthquakes with the same magnitude and hypocenter location. In the analysis, it is assumed that the variations of the spectral amplitude is composed of the between-events variations and the within-event variations (also called the intra-event variations and the inter-event variations), and evaluate the standard deviations of each variation. The evaluation result of the logarithmic standard deviation of the total variations () is about 0.35-0.45. And, the standard deviation of the between-events variations (B) is about 0.2, and the standard deviation of the within-event variations (W) is about 0.3-0.4. The W decreases with increasing the distance. This distance dependence can be caused by the effects of scattering of seismic waves in the path.

nihon kenchiku gakkai kozokei ronbunshu/nihon kenchiku gakkai kōzō-kei ronbunshū

VARIATION OF GROUND MOTION RESPONSE SPECTRA BASED ON PAIR GROUND MOTION RECORDS OBSERVED AT THE SAME SITE FROM TWO EARTHQUAKES WITH THE SAME MAGNITUDE AND HYPOCENTER LOCATION