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In this paper,according to the relationship of observation spectrum with source spectrum,travel-path attenuationfactor and site effect,we use the digital seismic data of moderate-small earthquakes to invert the soft rock site ef-fect and S wave inelastic attenuation under the constraint of site effect,and determine the parameters of path andsite.The parameters obtained by this method exclude the topographic effect of seismic stations,and truly reflectthe seismic effect of free soft rock sites and the S wave inelastic attenuation in the studied region.The average softrock site effect is about 1.5 times in the frequency domain of 2～4 Hz and the S wave quality factor is obtained asQS=278 f0.346,which can be directly applied to the stochastic modeling of ground motions in the studied region.
In this paper, according to the relationship of observation spectrum with source spectrum, travel-path attenuation factor and site effect, we use the digital seismic data of moderate-small earthquakes to invert the soft rock site ef-fect and S wave inelastic attenuation under the constraint of site effect, and determine the parameters of path andsite.The parameters obtained by this method exclude the topographic effect of seismic stations, and truly reflect the seismic effect of free soft rock sites and the wave inelastic attenuation in the studied region. average softrock site effect is about 1.5 times in the frequency domain of 2 ~ 4 Hz and the S wave quality factor is obtained as QS = 278 f0.346, which can be directly applied to the stochastic modeling of ground motions in the studied region.