地殻内地震に対するP波部・S波部・全継続時間の水平・上下動の距離減衰式

概要

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Attenuation relations of horizontal and vertical ground motions for P wave, S wave, and all duration are developed using strong motion records of 34 crustal earthquakes in Japan. The relations are for peak ground acceleration (PGA), peak ground velocity, and 5% damped acceleration response spectrum (SA) for radial, transverse, and vertical components. The regression coefficients show that reverse and oblique faults generate about 1.2times stronger ground motions in a short period range than strike-slip faults. The three-component attenuation relation of PGA for P wave approaches each other as the distance is longer due to scattering effect, although the PGA of vertical component is largest and the transverse component is smallest in the close distance. For S wave or all duration, the attenuation relation of PGV for transverse components is about 1.2 times larger than that for radial components in the case of strike-slip faults. The attenuation relations of PGA and SA in a short period range for reverse and oblique faults in the close distance significantly larger than previous attenuation relations derived using horizontal and vertical components of S wave or all duration in Japan.
2008-10-30