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Microzonation of Lisbon: 1-D Theoretical Approach

机译：里斯本微区划：一维理论方法

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摘要

— The geology of Lisbon is very diversified, with a predominance of cretaceous rocks (basalt and limestone) in the western zone, while east and south it is covered by progressively thicker Tertiary deposits with diverse lithologies (sands, clays, silts, sandstones and limestones) and different geotechnical properties. Lisbon also contains several narrow long valleys, filled with thin alluvial deposits. A set of new geological profiles was drawn, along the east–west direction, 500 meters spaced. These profiles were based on the existing geological maps and complemented with new information collected from recent geotechnical boreholes. Theoretical modeling, using the Thomson–Haskell 1-D approach, was performed for 314 geological columns chosen from these profiles according to a regular grid 500 meters long. The physical parameters were obtained from specialized literature, seismic experiments and laboratory tests. The results are presented as contour maps for the peak frequencies and for the corresponding amplification factors. These results are compared with the microzonation map obtained by microtremor analysis and with the damage distribution observed in past earthquakes.
机译：—里斯本的地质非常多样化，西部地区以白垩纪岩石（玄武岩和石灰石）为主，而东部和南部则被逐渐增厚的第三纪沉积物所覆盖，具有各种岩性（砂，粘土，粉砂，砂岩和石灰石） ）和不同的岩土属性。里斯本也有几个狭窄的长谷，上面充斥着薄薄的冲积物。沿东西方向绘制了一组新的地质剖面，相距500米。这些剖面基于现有的地质图，并补充了从最近的岩土钻孔中收集的新信息。使用Thomson-Haskell 1-D方法，根据500米长的规则网格，对从这些剖面中选择的314个地质柱进行了理论建模。物理参数来自专业文献，地震实验和实验室测试。结果以等高线图的形式显示出峰值频率和相应的放大系数。将这些结果与通过微震分析获得的微区图以及过去地震中观察到的破坏分布进行了比较。

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