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首页> 外文期刊>Bulletin of earthquake engineering >From regional- to local-scale seismic hazard assessment: examples from Southern Spain
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From regional- to local-scale seismic hazard assessment: examples from Southern Spain

机译：从区域到地方范围的地震灾害评估：西班牙南部的例子

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摘要

An approach that relates results from a regional seismic hazard assessment study with local-scale site-effect characterizations in an area of low-to-moderate seismic activity such as Andalusia (southern Spain), is presented. Results of a previous probabilistic seismic hazard analysis of Andalusia on rock conditions are disaggregated to infer hazard controlling earthquakes for different target motions. A collection of controlling magnitude-distance pairs and the corresponding site-specific response spectra at main capital cities of the region are obtained. These spectra are first-order approximations to expected seismic actions required in local earthquake risk assessments. In addition, results of independent, local-scale studies developed in Almeria City (SE Andalusia) are used to derive an updated seismic zonation of the city. These include predominant soil period estimates and shear-wave velocity profiles at different locations. If a local seismic risk assessment study or an earthquake-resistant structural design is to be developed, it may be recommended the use of different seismic actions on sites characterized by distinct response to seismic shaking (as derived from the seismic zonation). The seismic action related to worst-case scenarios may be modeled through a hazard-consistent response spectrum, obtained by hazard disaggregation at the spectral acceleration with period matching the prevailing resonant period of the target site or structure.
机译：提出了一种方法，该方法将区域地震危险性评估研究的结果与安达卢西亚（西班牙南部）等中低地震活动地区的局部规模现场影响特征联系起来。先前对岩石条件下的安达卢西亚概率地震危险性分析的结果进行了分解，以推断针对不同目标运动的危险性控制地震。获得了该地区主要首都城市的控制幅度距离对和相应的特定地点响应谱的集合。这些频谱是当地地震风险评估中所需的预期地震作用的一阶近似值。此外，在阿尔梅里亚市（安达卢西亚）开发的独立，局部规模研究的结果用于得出该市的最新地震带。这些包括主要的土壤周期估计和不同位置的剪切波速度剖面。如果要进行本地地震风险评估研究或抗震结构设计，则建议在特征在于对地震晃动有不同响应（源自地震分区）的地点使用不同的地震作用。与最坏情况有关的地震作用可以通过危险一致的响应谱来建模，该响应一致的谱是通过在具有与目标位置或结构的主要共振周期相匹配的周期的谱加速度下进行危险分解而获得的。

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