This paper presents recommended methodologies for the quantitative analysis of landslide hazard, vulnerability and risk at different spatial scales (site-specific, local, regional and national), as well as for the verification and validation of the results. The methodologies described focus on the evaluation of the probabilities of occurrence of different landslide types with certain characteristics. Methods used to determine the spatial distribution of landslide intensity, the characterisation of the elements at risk, the assessment of the potential degree of damage and the quantification of the vulnerability of the elements at risk, and those used to perform the quantitative risk analysis are also described. The paper is intended for use by scientists and practising engineers, geologists and other landslide experts.

Slow-moving landslides yearly induce huge economic losses worldwide in terms of damage to facilities and interruption of human activities. Within the landslide risk management framework, the consequence analysis is a key step entailing procedures mainly based on identifying and quantifying the exposed elements, defining an intensity criterion and assessing the expected losses. This paper presents a two-scale (medium and large) procedure for vulnerability assessment of buildings located in areas affected by slow-moving landslides. Their intensity derives from Differential Interferometric Synthetic Aperture Radar (DInSAR) satellite data analysis, which in the last decade proved to be capable of providing cost-effective long-term displacement archives. The analyses carried out on two study areas of southern Italy (one per each of the addressed scales) lead to the generation, as an absolute novelty, of both empirical fragility and vulnerability curves for buildings in slow-moving landslide-affected areas. These curves, once further validated, can be valuably used as tools for consequence forecasting purposes and, more in general, for planning the most suitable slow-moving landslide risk mitigation strategies

The shallow deposits of unsaturated pyroclastic soils\ud covering the slopes in the Campania region (southern Italy) are\ud systematically affected by various rainfall-induced slope instabilities. The type and triggering of these instabilities depend on\ud several factors, among which in situ soil suction—as an initial\ud condition—and rainfall—as a boundary condition—play a fundamental role. Based on the available database—which includes a\ud comprehensive catalogue of historical data, in situ soil suction\ud measurements and soil laboratory tests along with the results of\ud geomechanical analyses—this paper discusses the relationships\ud among in situ soil suction and rainfall conditions and induced\ud slope instability types. The goal is to reach a better understanding\ud of past events and gain further insight into the analysis and\ud forecasting of future events. In particular, the paper outlines how\ud the season strongly affects the spatial distribution and the type of\ud slope instability likely to develop. For example, erosion phenomena essentially occur at the end of the dry season and originate\ud hyperconcentrated flows while first-time shallow slides prevail in\ud the rainy season and later propagate as debris flows or as debris\ud avalanches

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