Path Effects on Prediction Equations of Pseudo-Velocity Response Spectra in Northern Japan

Abstract eng:
We perform regression analysis of pseudo-velocity response spectra of strong ground motions in the period range from 0.1 to 5.0 s by considering two different prediction equations: the first equation consists of a single term of anelastic attenuation and the second equation consists of two-term of anelastic attenuation. Strong-motion records from interplate and intraslab events with Mw ≥ 5.0 ~ 7.3 and hypocenter distances less than 300 km are used. Regression analysis results show that the standard errors are significantly reduced by the second prediction equation in the short periods less than about 1 s. The standard errors from the both prediction equations are nearly the same for period longer than 1 s. Finally, the anelastic attenuation coefficients obtained from the second prediction equation are discussed in terms of the different frequency dependency of the quality factor Q in the fore-arc and back-arc mantle wedges in northern Japan.

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