ABSTRACT

In regions of low-to-moderate seismicity where representative strong motion data is lacking, the modelling of seismic hazard relies on the use of seismological models. This paper presents a set of expressions that can be used as ground motion prediction equations that have been transformed from seismological models which resolve the generation of seismic waves into several components. The feature of this presented set of expressions is that it can be adapted to represent earthquake ground motion behaviour that is defined by a diversity of seismological models. The motivation behind the development of the presented adaptive predictive relationship which is known as the Component Attenuation Model (CAM) was to fast track, and make transparent, the transformation from seismological models to predictions of response spectral values for engineering applications. Thus, CAM can be used to waive away the need of executing any software for undertaking stochastic simulations nor time-history analyses for calculation of the response spectral ordinates. An important and original, the feature of CAM is incorporating the shear wave velocity profile of the bedrock and the associated upper-crustal modification into the model. This article presenting CAM is essentially a contribution to engineering as opposed to seismology. The potential benefits derived from the fast-tracking can be considerable given that the transformation is seldom a one-off process and would need to be repeated for any given targeted area, in view of uncertainties surrounding seismological conditions of the earth crust around the globe.

摘要

在缺乏代表性强震数据的中低地震活动地区，地震危险性建模依赖于地震模型的使用。本文提出了一组可以用作地震动预测方程的表达式，这些表达式是从地震模型转换而来的，地震模型将地震波的产生分解为几个分量。这组表达式的特点是它可以适应表示由各种地震模型定义的地震地震动行为。所提出的自适应预测关系的发展背后的动机，即分量衰减模型( CAM )) 旨在快速跟踪并透明化从地震模型到工程应用响应光谱值预测的转换。因此，CAM可用于免除执行任何用于进行随机模拟的软件或用于计算响应谱坐标的时间历史分析的需要。CAM的一个重要且原始的特征是将基岩的剪切波速度剖面和相关的上地壳修改纳入模型。本文介绍CAM本质上是对工程的贡献，而不是地震学。鉴于全球地壳地震条件的不确定性，这种转变很少是一次性的，并且需要针对任何给定的目标区域重复进行，因此快速跟踪带来的潜在好处是相当可观的。