Articles | Volume 17, issue 12
Nat. Hazards Earth Syst. Sci., 17, 2229–2243, 2017
https://doi.org/10.5194/nhess-17-2229-2017
Nat. Hazards Earth Syst. Sci., 17, 2229–2243, 2017
https://doi.org/10.5194/nhess-17-2229-2017

Research article 11 Dec 2017

Research article | 11 Dec 2017

Historical analysis of rainfall-triggered rockfalls: the case study of the disaster of the ancient hydrothermal Sclafani Spa (Madonie Mts, northern-central Sicily, Italy) in 1851

Antonio Contino1,2, Patrizia Bova2, Giuseppe Esposito1,2, Ignazio Giuffré2, and Salvatore Monteleone1 Antonio Contino et al.
  • 1Dipartimento di Scienze della Terra e del Mare (DiSTeM), University of Palermo, Via Archirafi 20/22, 90123 Palermo, Italy
  • 2Accademia Mediterranea Euracea di Scienze, Lettere e Arti (AMESLA), Via Gregorio Ugdulena 62, 90018 Termini Imerese (Palermo), Italy

Abstract. In 1851, the region of Sicily experienced many rainstorm-induced landslides. On 13 March 1851, a rainstorm brought about a severe rockfall disaster near the small town of Sclafani (Madonie Mountains, northern-central Sicily, Italy). Rocks detached from the carbonate crest of Mt Sclafani (813 m above sea level) and fell downslope, causing the collapse of the ancient hydrothermal spa (about 430 m above sea level) and burying it. Fortunately, there were no injuries or victims. Given its geological, geomorphological and tectonic features, the calcareous–dolomitic and carbonate–siliciclastic relief of Mt Sclafani is extremely prone to landsliding. This study combines the findings of detailed geological and geomorphological field surveys and of a critical review of documentary data. A thorough analysis of documentary sources and historical maps made it possible to identify the location (previously unknown) of the ancient spa. The rockfall dynamics was reconstructed by comparing field reconnaissance data and documentary sources. The 1851 event reconstruction is an example of the application of an integrated methodological approach, which can yield a propaedeutic, yet meaningful picture of a natural disaster, paving the way for further research (e.g. slope failure susceptibility, future land-use planning, protection of thermal springs and mitigation of the impact of similar disasters in this area). Indeed, the intensification of extreme weather events, caused by global warming induced by climate change, has increased the risk of recurrence of a catastrophic event, like that of the ancient Sclafani spa, which is always a potential threat.

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