震源深度对基岩地震动参数的影响

Effect of Focal Depth on Bedrock Ground Motion Parameters

基于安徽地区震源深度分布特征,选取典型场点构造不同震源深度分析模型,重点分析了震源深度的变异性对于基岩地震动参数的影响。研究结果表明:随着震源深度增加,基岩峰值加速度及加速度反应谱逐渐减小,且基岩峰值加速度减小幅度呈逐渐减弱的趋势;但水平向加速度反应谱特征周期随着震源深度增大而增大,同时震源深度对不同风险水平下基岩峰值加速度比值也产生一定的影响。

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 fo cal depth on the ratios of between bedrock peak accelerations under different risk levels.