The 2016–2017 seismic events that struck central Italy led the Government to carry out a project to produce the third level Seismic Microzonation studies in 138 municipalities. These activities have involved many experts in different disciplines such as geology, geomorphology, geophysics, seismology and geotechnical engineering. This project represented the first opportunity to perform nationally coordinated third level Seismic Microzonation studies over a wide area in a quite short time (6 months). It provided the chance to improve methodological procedures, to test the reliability of methods and models for site response analyses and to produce a huge amount of validated data. This paper focuses on the contribution of geological disciplines and concerns: (a) the definition of the main “morphostructural domains” of the Central-Northern Apennines; (b) the creation of an archive of all the lithostratigraphic units occurring in the study area with their conversion into engineering-geological units and their distribution in the different morphostructural domains; (c) the construction of the reference geological and geotechnical models, which are essential to classify the territory into seismically homogeneous microzones and to perform the successive 1D and 2D numerical analyses of the local site response. The geophysical dataset acquired for the study allowed a first statistical characterization of the Vs values typical of the engineering-geological units identified in this study. Some examples of the recurrent geological and geotechnical models are shown to explain the complexity and variety of the geological and geomorphological features of the investigated area and to highlight the different seismostratigraphic behavior of rocks and cover terrains. The analysis of third level Seismic Microzonation data made it possible to identify recurrent subsoil models and to note the main stratigraphic and morphological control-factors of the ground motion modification in the different morphostructural domains.

中文翻译：

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意大利中部三级地震微区划研究的地质和岩土模型定义

在意大利中部发生的2016-2017年地震事件导致政府在138个城市开展了一个进行三级地震微区划研究的项目。这些活动吸引了地质，地貌，地球物理学，地震学和岩土工程等不同学科的许多专家。该项目是第一个机会，可以在很短的时间内（6个月）在广阔的区域内进行国家级的三级地震微带化研究。它提供了改进方法程序，测试用于现场响应分析的方法和模型的可靠性以及产生大量经过验证的数据的机会。本文着重于地质学科和关注点的贡献：（a）中北部亚平宁山脉主要“形态结构域”的定义；（b）建立研究区内所有岩性地层学单位的档案，并将其转换为工程地质单位，并将其分布在不同的形态结构域中；（c）构建参考地质和岩土模型，这对于将领土划分为地震上均质的微区并进行局部场地响应的连续一维和二维数值分析至关重要。为该研究而获得的地球物理数据集允许对该研究中确定的工程地质单位的典型Vs值进行首次统计表征。给出了一些循环地质和岩土模型的例子，以解释所研究区域的地质和地貌特征的复杂性和多样性，并强调岩石和覆盖地带的不同地层行为。对第三级地震微区带数据的分析使得有可能识别复发性地下土模型，并注意到在不同形态结构域中地震动修正的主要地层和形态控制因素。