Microzonation for earthquake-induced liquefaction hazard is the subdivision of a territory at a municipal or submunicipal scale in areas characterized by the same probability of liquefaction manifestation for the occurrence of an earthquake of specified intensity. The liquefaction hazard at a site depends on the severity of expected ground shaking as well as on the susceptibility to liquefaction of that site. This in turn depends on geological, geomorphological, hydrogeological and geotechnical predisposing factors. Thus, liquefaction hazard implies the existence of territories characterized by a moderate to high level of intensity of expected ground shaking. Microzonation charts for ground shaking and liquefaction hazard play a key role for the mitigation of seismic risk of an urban centre as they provide a valuable tool for the implementation of prevention strategies and land use planning. The LIQUEFACT project fully addressed the problem of microzoning a territory for earthquake-induced liquefaction hazard in a specific work package. Four municipal testing areas were selected across Europe as peculiar case studies where to construct microzonation charts for earthquake-induced liquefaction hazard. They are located in Emilia-Romagna region (Italy), Lisbon metropolitan area (Portugal), Brežice territory (Slovenia) and Marmara region (Turkey). Their location was identified based on the following criteria: severity of expected seismic hazard, availability of geological and geotechnical data, presence of liquefiable soil deposits, documented cases of liquefaction manifestations occurred in historical earthquakes, representativeness of different geological settings, density of population in selected areas (exposure). This paper illustrates the general procedure developed in LIQUEFACT for the assessment of earthquake-induced liquefaction hazard at urban scale and presents the main achievements of the microzonation studies carried out at the four previously mentioned European testbeds. Since the microzonation studies have been carried out using a shared framework and methodology, this paper has the ambition to serve as technical guidelines for updating the standards and the operational criteria currently used in different countries worldwide to construct seismic microzonation maps of liquefaction hazard.

地震引起的液化危险的微区划是指在具有指定地震强度的液化表现具有相同概率的地区，以市政或市级规模对区域进行细分。场所的液化危险取决于预期的地面震动的严重程度以及该场所对液化的敏感性。反过来，这取决于地质，地貌，水文地质和岩土工程的诱发因素。因此，液化危险意味着存在以中等至高强度的预期地面震动为特征的领土。地面震动和液化危害的微区图对于减轻城市中心的地震风险起着关键作用，因为它们为实施预防策略和土地利用规划提供了宝贵的工具。LIQUEFACT项目完全解决了在特定工作包中对因地震引起的液化危害进行微区划的问题。在整个欧洲，选择了四个市政测试区域作为特殊案例研究，在这些区域中构建地震引起的液化危害的微区划图。他们分别位于意大利的艾米利亚—罗马涅地区，葡萄牙的里斯本市区，斯洛文尼亚的布雷热采地区和土耳其的马尔马拉地区。根据以下标准确定了它们的位置：预期地震危险的严重程度，地质和岩土数据的可用性，存在可液化的土壤沉积物，在历史地震中记录有液化现象的案例，不同地质环境的代表性，选定区域的人口密度（暴露）。本文说明了LIQUEFACT中开发的用于评估城市规模地震诱发的液化危害的通用程序，并介绍了在前面提到的四个欧洲测试平台上进行的微区划研究的主要成果。由于微区划研究是使用共享的框架和方法进行的，因此本文有志于作为技术准则，以更新目前在世界范围内不同国家用于构建液化危害地震微区划图的标准和操作标准。记录在历史地震中的液化表现案例，不同地质环境的代表性，选定地区的人口密度（暴露）。本文说明了LIQUEFACT中开发的用于评估城市规模的地震引起的液化危害的通用程序，并介绍了在前面提到的四个欧洲测试平台上进行的微区划研究的主要成果。由于微区划研究是使用共享的框架和方法进行的，因此本文有志于作为技术准则，以更新目前在世界范围内不同国家用于构建液化危害地震微区划图的标准和操作标准。记录在历史地震中的液化表现案例，不同地质环境的代表性，选定地区的人口密度（暴露）。本文说明了LIQUEFACT中开发的用于评估城市规模地震诱发的液化危害的通用程序，并介绍了在前面提到的四个欧洲测试平台上进行的微区划研究的主要成果。由于微区划研究是使用共享的框架和方法进行的，因此本文有志于作为技术准则，以更新目前在世界范围内不同国家用于构建液化危害地震微区划图的标准和操作标准。