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5Šª
”NF
1978”N
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217-224•Å
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PROCEEDINGS OF JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM
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Makoto KAMIYAMA
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WAVE INTERPRETATION OF STRONG EARTHQUAKE GROUND MOTIONS
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A multiple filter technique is applied to strong earthquake ground motions in order to get nonstationary spectral characteristics. The analysis of several typical SMAC records obtained in Japan indicates that a significant portion of strong earthquake ground motion has a kind of regularity in nonstationary spectral characteristics. The regularity is explained by dispersion characteristics of surface waves. A simulation computation for surface waves propagating through a heterogeneous ground is carried out to verify the adequacy of the explanation. It is concluded that the principal motions of the SMAC records consist of surface waves.
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