This paper presents an overview of the geophysical activities for the seismic microzonation of 138 municipalities belonging to four Italian regions (Abruzzo, Lazio, Marche and Umbria) that were severely damaged by the seismic sequence of Central Italy (August 2016–January 2017). This study is the result of a collaborative effort between research Institutions and professional geologists with the support of local Administrations and the Italian Civil Protection Department and sets an unprecedented large-scale example of geophysical investigations supporting detailed seismic microzonation studies. This manuscript presents the methodological approach adopted for the geophysical activities, including the technical protocols and procedures, the best practices, the final products and the results supporting a detailed microzonation study of III level. The first step of the study was the collection and critical review of all available geophysical and geological information for planning the new geophysical surveys (specifically their type and location), in order to assess the subsoil geometry and the seismic characterization of the areas under investigation. Integration with the newly acquired geophysical data allowed the identification of zones with homogeneous local seismic hazard as well as the reference seismo-stratigraphy for each area, defining for each geological unit the ranges of the relevant properties in seismic amplification studies: layering and thicknesses, density, P-wave and S-wave seismic velocity. We also present a few representative case studies illustrating the geophysical investigation for different geomorphological situations. These examples, together with the findings of the entire project, are discussed to point out the strength points and the criticalities, as well as the necessary requirements in the application of geophysical methods to detailed microzonation studies.

中文翻译：

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地震微区划的广泛地面地球物理勘探

本文概述了意大利四个地区（阿布鲁佐，拉齐奥，马尔凯和翁布里亚）的138个城市的地震微区带的地球物理活动，这些地区受到意大利中部地震序列的严重破坏（2016年8月至2017年1月）。这项研究是研究机构与专业地质学家在地方政府和意大利民防部门的支持下共同努力的结果，并为支持详细的地震微带研究的地球物理研究提供了前所未有的大规模范例。该手稿介绍了地球物理活动采用的方法学方法，包括技术规程和程序，最佳实践，最终产品以及支持III级微区划研究的结果。研究的第一步是收集和严格审查所有可用的地球物理和地质信息，以规划新的地球物理勘测（特别是其类型和位置），以便评估地下土壤的几何形状和所调查区域的地震特征。与新获取的地球物理数据集成后，可以识别出具有均质局部地震危险的区域以及每个区域的参考地层，从而为每个地质单位定义了地震放大研究中相关属性的范围：分层和厚度，密度，P波和S波地震速度。我们还提出了一些具有代表性的案例研究，说明了不同地貌情况的地球物理研究。这些例子