Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Yamada, K. Articles by Horike, M. Search for Related Content GeoRef GeoRef Citation

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.