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The importance of crustal structure in explaining the observed uncertainties in ground motion estimation

机译:地壳结构在解释地震动估计中观察到的不确定性方面的重要性

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摘要

In this short article, the possible reduction in the standard deviation of empirical ground motion estimation equations through the modelling of the effect of crustal structure is assessed through the use of ground-motion simulations. Simulations are computed for different source-to-site distances, focal depths, focal mechanisms and for crustal models of the Pyrenees, the western Alps and the upper Rhine Graben. Through the method of equivalent hypocentral distance introduced by Douglas et al. [(2004) Bull Earthquake Eng 2(1): 75-99] to model the effect of crustal structure in empirical equations, the scatter associated with such equations derived using, these simulated data could be reduced to zero if real-to-equivalent hypocentral distance mapping functions were derived for every combination of mechanism, deptil and crustal structure present in the simulated dataset. This is, obviously, impractical. The relative importance of each parameter in affecting the decay of ground motions is assessed here. It is found that variation in focal depth is generally more important than the effect of crustal structure when deriving the real-to-equivalent hypocentral distance mapping functions. In addition, mechanism and magnitude do not have an important impact on the decay rate.
机译:在这篇简短的文章中,通过使用地震动模拟来评估通过对地壳结构的影响进行建模而可能减少的经验地震动估计方程的标准偏差。针对不同的震源到站点的距离,焦深,震源机制以及比利牛斯山脉,西部阿尔卑斯山和莱茵河上格拉本的地壳模型进行了模拟计算。通过道格拉斯等人介绍的等效下心距方法。 [(2004)Bull Earthquake Eng 2(1):75-99]建模地壳结构在经验方程式中的作用,使用此类方程式推导的与此类方程式相关的散射,如果实数等效,则这些模拟数据可以减少为零对于模拟数据集中存在的机制,分离和地壳结构的每种组合,都得出了震中距离映射函数。显然,这是不切实际的。在此评估每个参数在影响地面运动衰减方面的相对重要性。已经发现,在推导实等值的次中心距映射函数时,焦深的变化通常比地壳结构的影响更为重要。此外,机理和幅度对衰减率没有重要影响。

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