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Deep-Borehole-Measured Q_P and Q_S Attenuation for Two Kanto Sediment Layer Sites

Yokohama City University, Seto 22-2, Kanazawa-ku, Yokohama, 236-0026 Japan

Using a comparison between a direct body-wave phase and its surface-reflected phase recorded on the same deep-borehole seismogram, 1/Q_P(f) and 1/Q_S(f) were measured in the frequency range from 1 to 10 Hz in a sedimentary layer-basement system at the SHM and FCH stations in the Kanto region, Japan. Estimated values of 1/Q_P(f) and 1/Q_S(f) decrease linearly with increasing frequency at low frequencies. This frequency dependence weakens with increasing frequency. The frequency points at which these two characteristics intersect are approximately 4 and 2 Hz for 1/Q_P(f) and 1/Q_S(f), respectively. The relation of Q_S(f)/Q_P(f)1 was measured over the frequency range from 1 to 10 Hz. However, Q_S(f)/Q_P(f) is in the range of 1.5–3 for frequencies lower than 3 Hz and Q_S(f)/Q_P(f)1 for frequencies higher than 4 Hz.