Effect of Focal Depth on Bedrock Ground Motion Parameters

Based on focal depth distribution features of Anhui area, this paper mainly studied the influence of the variability of focal depth on bedrock ground motion parameters by constructing analysis model of different focal depth with typical sites. The results show that, bedrock peak acceleration and acceleration response spectrum decrease gradually with the increase of focal depth, and the decreasing range of bedrock peak acceleration is gradually weakened. But the characteristic period of horizontal acceleration response spectrum increases gradually with the increase of focal depth. Meanwhile, there are some influences of focal depth on the ratios of between bedrock peak accelerations under different risk levels.