地震 第2輯
Online ISSN : 1883-9029
Print ISSN : 0037-1114
釧路地方気象台における強震動と弱震動に対するサイト特性の評価
山本 みどり岩田 知孝入倉 孝次郎
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48 巻 (1995-1996) 3 号 p. 341-351

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We propose a new method to estimate site amplification effects at specific sites, separating source and propagation-path effects. First, we calculate “specified spectra” from a given source and propagation-path effects, with a fixed site effect of 2.0. Then, we include effects of rupture process into the “specified spectra” using the empirical Green's function method. Site effects can be defined as a ratio of observed seismic spectra to the “specified spectra”. We applied this method to the ground motion data during the 1993 Kushiro-oki earthquake as strong motions and those of other small earthquakes as weak motions in the south-east area of Hokkaido. We found nonlinear site effects at the station KSR, in Kushiro city, where the maximum of horizontal amplitude was 711.4cm/s2 during the 1993 Kushiro-oki earthquake. The predominant frequency of the site effects became smaller and the amplification level of those at high frequencies became lower than those for the weak motions.

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地震 第1輯

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