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Seismic hazard and design earthquakes for the central archaeological area of Rome

机译：罗马中央考古区的地震灾害和设计地震

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摘要

In order to evaluate the seismic input suitable to be used for the microzonation of the central archaeological area of Rome, two different approaches were used: Probabilistic and Deterministic Seismic Hazard Assessment (PSHA, DSHA). For PSHA, three Uniform Hazard Spectra and three design spectra, derived from the literature and the Italian regulations, were considered. For DSHA two possible design earthquakes were selected: one having a magnitude 5.5 and a distance 20 km and the other having a magnitude 7 and a distance 85 km. The choice of these two scenarios was supported by the analysis of historical and instrumental seismicity, by the study of the surrounding faults, and by the disaggregation of the seismic hazard. The standard PSHA, based on seismogenic zones with uniformly distributed seismicity used for the Italian hazard map and building code, results in higher values with respect to DSHA (PGA of about 0.12 g and spectral maximum of around 0.35 g), unless an appropriate fraction of the standard deviation of the attenuation relationship is considered in the deterministic analysis.Recorded accelerograms, corresponding to themagnitude-distance couples selected using the DSHA were also included in the analysis. The seismic input was represented in terms of acceleration response spectra and time histories.
机译：为了评估适合用于罗马中央考古区微区划的地震输入，使用了两种不同的方法：概率和确定性地震危险性评估（PSHA，DSHA）。对于PSHA，考虑了来自文献和意大利法规的三个统一危险光谱和三个设计光谱。对于DSHA，选择了两种可能的设计地震：一次地震为5.5级，距离20 km，另一次地震为7级，距离85 km。通过对历史和仪器地震活动的分析，对周围断层的研究以及对地震危险的分类，可以支持这两种情况的选择。标准PSHA基于用于意大利危险地图和建筑规范的具有均匀分布地震活动的成地震带，相对于DSHA，PSHA值较高（PGA约为0.12 g，光谱最大值约为0.35 g），除非确定性分析中考虑了衰减关系的标准偏差。分析中还包括与使用DSHA选择的幅度距离对相对应的记录的加速度图。地震输入以加速度响应谱和时间历程表示。

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