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Inference of Q-Values below 1 Hz from Borehole and Surface Data in the Osaka Basin by Three-Component Waveform Fitting

¹ Hanshin Consultants Co., Ltd.
1-6-19 Imabashi
Chuo-ku, Osaka, 541-0042 Japan
yamada{at}hanshin-consul.co.jp

The quality factor of the shear waves Q_s below 1 Hz in the Osaka sedimentary basin, Japan, is inferred from borehole earthquake-motion recordings and surface earthquake-motion recordings by three-component waveform fitting. Assuming quality factor of S waves Q_s to be a function of the frequency f and the shear- wave velocity V_s in meters in the form AV_s f ⁿ, the waveform fitting of borehole data reveals that coefficient A is approximately 0.24, and exponent n is less than or equal to zero. To verify Q_s-values from borehole data and, if possible, to confine Q_s-values to a narrow range, we infer the Q_s-values from surface earthquake-motion recordings by fitting them with earthquake motions simulated by the finite-difference method. It indicates that Q_s-values are negatively frequency dependent and that the lower limit of Q_s-values is approximately 0.24V_s f^–1.