Abstract

A method is proposed for calculating seismic hazard curves in a free-field. The applicability of the method is illustrated by a hypothetical situation characteristic to seismotectonic and ground conditions in platform areas: low local activity, proximity to a deep focal area, and a shallowly basement overlain by a consolidated soil profile. Presentation of the ground conditions by single parameter Vs30 (average velocity of transverse waves in upper 30 m of the soil profile) is not sufficient. Although such a description gives generally higher spectral amplitudes, it does not take into account amplification due to possible resonance phenomena; meanwhile, energy absorption in the soil profile due to inelastic behavior is ignored.

中文翻译：

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自由场中地震危险曲线的计算方法

摘要

提出了一种计算自由场地震危险曲线的方法。该方法的适用性通过平台区域地震构造和地面条件的一种假设情况来说明：局部活动低，靠近较深的震源区域以及被固结的土壤剖面覆盖的浅层地下室。仅凭单个参数Vs30（土壤剖面上30 m中横波的平均速度）表示地面状况是不够的。尽管这种描述通常会给出更高的频谱幅度，但由于可能的共振现象，并未考虑放大。同时，由于非弹性行为引起的土壤剖面能量吸收被忽略。