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PROCEEDINGS OF THE JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM
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Mitsuko FURUMURA, Tsutomu SASATANI, Toshiro KOYANAGI, Seiji SAITO
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THE LONG-PERIOD SEISMIC RESPONSE OF THE TOKACHI PLAIN
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Seismic observations were carried out in and around the Tokachi plain. The comparison of the seismograms obtained by a rock and sediment station pair revealed strong amplification of S waves and strong excitation of surface waves in the frequency range of 0.2 - 1.0Hz in the Tokachi plain. By the semblance and polarization analysis of small-aperture array data on the sedimentary site, it has been found that the surface waves excited in the Tokachi plain were mainly composed of fundamental Rayleigh and Love waves.
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