The effects of extreme precipitations on landslide hazard in the pyroclastic deposits of Campania Region: a review

• Published in: Landslides Vol. 17; no. 10; pp. 2343 - 2358
• Main Authors: Picarelli, L., Olivares, L., Damiano, E., Darban, R., Santo, A.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.10.2020; Springer Nature B.V
• Subjects: Agriculture; Avalanches; Catastrophic failure analysis; Civil Engineering; Debris flow; Earth and Environmental Science; Earth Sciences; Earthquakes; Failure mechanisms; Flowslides; Geography; Geological hazards; Geomorphology; Grain size; Laboratory tests; Landslides; Landslides & mudslides; Liquefaction; Lithology; Morphology; Natural Hazards; Precipitation; Shear strength; Slopes; Soil; Surveys; Technical Note; Volcanic activity; Volcanoes; Campania Italy; Italy; Debris flow; Flowslide; Liquefaction; Rainfall; Slope failure; Debris avalanche; Pyroclastic soil
• ISSN: 1612-510X; 1612-5118
• DOI: 10.1007/s10346-020-01423-5

In the last ten thousand years, the explosive activity of some volcanic centers has blanketed with pyroclastic soils the major part of Campania Region, Southern Italy. Experience shows that the sloping deposits may be mobilized by long-lasting precipitations, leading to rapid and sometimes catastrophic flow-type slope movements. This paper summarizes the present knowledge on this subject based on the results of both laboratory tests and experiments and on a review of the main data provided by field surveys. In particular, a careful examination and analysis of the available elements highlight the key role played by lithological and morphological details on failure and post-failure mechanisms, thus affecting landslide hazard. In fact, it is shown that deposition mode and grain size, slope angle, and morphology strongly affect the type of post-failure movement, which may take the features of a debris avalanche, of a debris flow, or of a flowslide and may lead (or not) to soil liquefaction, a mechanism that strongly affects both displacement rate and run-out.