強震記録に基づく震源近傍での地震動強さ

概要

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Evaluation of near-field ground motion is one of the most important issues in the seismic design of critical structures. In this paper, the strong motion data observed in epicentral areas whose earthquakes with magnitude greater than 6.0 including recent earthquakes with magnitude are about 7.5, is compiled in order to examine the ground motion intensity due to a close-distance earthquake. The peak horizontal acceleration generally range 0.3g to 1.0g. The upper value of the peak horizontal velocity range almost 150 to 200cm/s, but the records of the 1999 ChiChi earthquake with magnitude 7.6, shows the peak horizontal velocity greater than 250cm/s. The characteristics of spectra of the strong motion records for magnitude about 7.5 are different from those for magnitude about 7. The predominant period of the records is longer in proportion to magnitude, the period for magnitude 7 and 7.5 are about 2 to 3sec., and about 5sec. respectively. The relationship of magnitude and predominant period shows good corresponding to the rupture duration of the largest asperity, so the predominant period of spectrum is affected by the asperity size of the earthquake.
一般社団法人日本建築学会の論文
2001-03-20