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Modelling site amplification effects for eastern Cuba

机译：古巴东部建模站点扩增效应

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摘要

The expected soil amplification has been computed for eastern Cuba considering two combined methods: a geological approach, based on the soil classification (actually two alternative methods: from surficial geology and deep lithology), and a geotechnical method, based on 1D modelling. Based on the regional geological maps, soil category maps and regional geological profiles, 45 geological models (26 for rock and 19 for surficial deposits) have been established for the entire study region. Adding the information from deep borehole data, 36 geotechnical models have been identified to represent the 19 surficial deposits in the study region, plus one for rock. In fact, after a preliminary soil characterization based only on surficial geology, the mechanical properties and thickness of the different layers within the first 30 m have been considered as main geological characteristics to identify the soil class and the related V-S30, according to the NEHRP provisions, and the related proper amplification factors (AFs) have been derived. In addition, 1D soil modelling has been performed to obtain soil AFs in the homogeneous sectors in which the study region has been partitioned. A comparison performed between the AFs calculated by modelling and those estimated in agreement with the NEHRP provisions has shown quite large differences. These results, although not representing a substitution for a real microzonation study, can be useful in improving seismic hazard estimates for a general seismic risk quantification, urban planning, and seismic code updating.
机译：考虑到两种组合方法，基于土壤分类（实际上是两种替代方法：从表格地质学和深层岩性）以及基于1D建模的地质方法，已经计算了预期的土壤放大基于区域地质地图，土壤类地图和区域地质型材，为整个研究区建立了45个地质模型（26岩石和岩石和19个岩石和19个）。添加来自深层钻孔数据的信息，已经确定了36种岩土电石模型来代表研究区域的19个表格沉积物，加上一个用于岩石。实际上，在仅基于曲面地质的初步土壤表征之后，第一30米内的不同层的机械性能和厚度被认为是识别土壤类和相关V-S30的主要地质特征，如下Nehrp的规定和相关的适当放大因子（AFS）已经得出。此外，已经进行了1D土壤建模，以在均匀部门中获得土壤AFS，其中研究区已被分区。通过建模计算的AFS与与NEHRP规定估​​计的人之间进行的比较显示了相当大的差异。这些结果虽然没有代表真实的微微沉积研究的替代，但可以有助于改善普通地震风险量化，城市规划和地震代码更新的地震危害估计。

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