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首页> 外文期刊>Bulletin of earthquake engineering >Toward an empirical ground motion prediction equation for France: accounting for regional differences in the source stress parameter
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Toward an empirical ground motion prediction equation for France: accounting for regional differences in the source stress parameter

机译：朝向法国的经验地面运动预测方程：源压力参数的区域差异核算

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In low-to-moderate seismicity regions such as metropolitan France, characterized by limited strong-motion records in the magnitude-distance range of interest for seismic hazard assessment, the derivation of empirical ground motion prediction equations (GMPEs) is a major challenge. In this study, we take advantage of the RESORCE-2013 database (http://resorce-portal.eu/) that contains uniformly processed records for the Pan-European region including relevant number of French records. After discussing the metadata for French events and stations, we first derive a base-case GMPE that is used to investigate the within-event and between-event residuals. The short-period between-event residuals for French (and Swiss) events show larger variability with respect to larger magnitude events in other regions. We show that the between-event residuals are clearly correlated with the stress parameter and that such larger variability can be explained by accounting for stress-parameter scaling. We derive an empirical scaling of ground motion with stress parameter that is consistent across regions and with the scaling predicted by stochastic GMPEs. This suggests that the scaling of ground motion with stress parameter for a given magnitude is largely region independent whereas the absolute stress parameter values may vary regionally. Based on these results we propose to adopt the scaling model as a function of stress parameter and magnitude by Yenier and Atkinson (Bull Seismol Soc Am 105(4):1989-2009, 2015) by adapting the reference stress parameter to our target regions. By accounting for stress parameter scaling in the GMPE we reduce the between-event variability for French and Swiss small-magnitude events. Finally, we investigate the aleatory variability (sigma) of the GMPE and its components (tau, phi, phi(ss)). We propose a heteroscedastic sigma model to be used when the stress-parameter scaling is not considered in the GMPEs due to lack of information. If enough information on the stress-parameter is available the adjusted GMPE can be applied using a homoscedastic sigma. Despite using small events, the phi(ss) for French stations is found to be consistent with other studies and confirms the stability of phi(ss) across different regions and datasets.
机译：在诸如大都市的低于中等地震性地区，其特征在于对地震危害评估的幅度距离范围内的有限的强运动记录，经验地面运动预测方程（GMPE）的推导是一个主要挑战。在这项研究中，我们利用了泛欧洲地区的统一处理记录，包括有关法国记录的统一加工记录的统一处理记录。在讨论法国事件和站的元数据之后，我们首先推出了一个基本案例的GMPE，用于调查内部活动和活动之间的残差。法国（和瑞士）事件的短期内 - 事件与其他地区更大幅度事件的变化较大。我们表明，事件之间的残差与应力参数明显相关，并且可以通过考虑应力参数缩放来解释这种更大的可变性。我们通过跨区域和随机GMPE预测的缩放来得出与应力参数的实证缩放。这表明，具有给定幅度的应力参数的地面运动的缩放在很大程度上是区域独立的，而绝对应力参数值可以在区域上变化。基于这些结果，我们建议通过Yenier和Atkinson（公牛地震奖Soc Am 105（4）：1989-2009,2015）作为yenier和Atkinson（公牛地震奖Soc Am 105（4）：1989-2009,2015）作为压力参数和级别的函数。通过在GMPE中考虑压力参数缩放，我们减少了法语和瑞士小幅度事件的活动之间的活动变化。最后，我们研究了GMPE及其组分（TAU，PHI，PHI（SS））的蛋白变异性变异性（SIGMA）。我们提出了一种由于缺乏信息而在GMPE中未考虑的应力参数缩放时要使用的异源型SIGMA模型。如果有关应力参数的足够信息可用，则可以使用同性恋的Sigma应用调整后的GMPE。尽管使用小事，但法国站的PHI（SS）将与其他研究一致，并确认在不同地区和数据集中的PHI（SS）的稳定性。

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