Michele SANTANGELO, CNR IRPI, Italy
Ivan MARCHESINI, CNR IRPI, Italy
Francesco BUCCI, CNR IRPI, Italy
Mauro CARDINALI, CNR IRPI, Italy
Marco CAVALLI, CNR IRPI, Italy
Stefano CREMA, CNR IRPI, Italy
Lorenzo MARCHI, CNR IRPI, Italy
Massimiliano ALVIOLI, CNR IRPI, Italy
Fausto GUZZETTI, CNR IRPI, Italy
Starting on 24th August 2016, Central Italy was struck by a six-month earthquake sequence that killed 303 people and caused extensive damages. In some cases entire villages needed complete rebuilding. In this paper we present a method that led to the definition the overall susceptibility to multiple landslide types and the exposure to landslides of the rural-urban areas of the Castelsantangelo sul Nera Municipality, a typical village of the central Italian Apennine. The procedure ingests geomorphological data and models and groups the individual landslide susceptibility maps in a joint susceptibility and exposure map based on expert-defined criteria.
The procedure is aimed at integrating (i) a heuristic geomorphological model for shallow (SL) and deep-seated (DL) landslides of the slide type (Cardinali et al., 2002), (ii) two conceptual models to define areas potentially affected by debris-flows (DF, Mergili et al., 2015), (iii) a distributed physically based model to delineate the rockfall (RF, Guzzetti et al., 2002; Alvioli et al., 2021) runout areas. The outputs of the models were then combined to define the overall susceptibility and exposure to landslide hazards of areas with similar morphological characteristics to selected built-up areas.
Despite its expeditious approach, the procedure is general and applicable to evaluate the landslide susceptibility conditions and exposure of (i) built-up damaged areas, (ii) destroyed areas to be relocated, and (iii) undeveloped areas within which to relocate the destroyed centres, or parts of them. Although it was designed to solve local problems, the procedure is not specific or limited to such areas but may be applied to other areas where similar answers must be given in a limited amount of time.
The output map was used as a tool for planning post-seismic reconstruction. We advise that such maps are used also as basic tool for ordinary urban planning.
Mots clés : landslide exposure|emergency support|post-seisimic reconstruction|landslide susceptibility|multiple landslide hazards
A103507MS