http://www.cnr.it/ontology/cnr/individuo/prodotto/ID41465
Seven landslide dams of old seismic origin in southeastern Sicily (Italy) (Articolo in rivista)
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- Label
- Seven landslide dams of old seismic origin in southeastern Sicily (Italy) (Articolo in rivista) (literal)
- Anno
- 2002-01-01T00:00:00+01:00 (literal)
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- Nicoletti P.G., Parise M. (literal)
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- Il lavoro può essere utilizzato quale contributo all'esplorazione delle condizioni geologiche, morfologiche ed idrologiche che influiscono sulla longevità delle dighe da frana e che in ultima analisi controllano i derivanti pericoli. La sede di pubblicazione è uno dei più importanti periodici del settore geomorfologia, ed ha: 2002 Total Cites = 1478; Impact Factor = 1.669; Immediacy Index = 0.151; 2002 Articles = 139; Cited Half-life = 5.4. (literal)
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- Rivista
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- L'articolo descrive origine, morfologia ed evoluzione di sette dighe naturali formate da antiche frane sismo-indotte che hanno sbarrato corsi d'acqua della Sicilia sud-orientale. Gli sbarramenti fluviali sono uno degli effetti della franosità sismo-indotta di quel territorio, recentemente riconosciuta e sottoposta ad indagine. In ciascun sito vengono individuati i possibili pericoli connessi ad una riattivazione dei processi. (literal)
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Titolo
- Seven landslide dams of old seismic origin in southeastern Sicily (Italy) (literal)
- Abstract
- This paper focuses on origin, morphology and evolution of seven landslide dams in southeastern Sicily. These landforms are part of a set of 146 landslides recently recognised in this area, which was hitherto considered to have little or no slope instability. Southeastern Sicily consists of a plateau (the Hyblaean Mountains) incised by canyons and surrounded by lower lands. It is underlain mostly by subhorizontal, moderately to well- lithified carbonate rocks. Relief is low. Several lines of evidence justify the assumption of a seismic trigger for the landslides in this area: (1) the geo-climatic environment is not favourable to landsliding, (2) low-angle basal shear surfaces are very frequent, (3) landslide distribution is consistent with the known magnitude-distance relationships for earthquake-induced landslides, (4) historical documents testify to earthquake-triggered slope instability and (5) a specific landslide can be exactly dated. The phenomena illustrated here include six rock slides (one with a debris-flow component) and one rock fall. Slip surfaces are mostly non-circular. Landslide volume ranges from about 50,000 m3 to 34,000,000 m3. With reference to the Costa and Schuster [Geol. Soc. Am. Bull 100(1988) 1054] classification of landslide dams, five cases belong to type II (spanning the entire valley), and two to type IV (failures from both valley sides, with frontal or side contact between failed masses). With reference to the Crozier and Pillans [Catena 18 (1991) 471]classification of landslide lakes, all cases show a main valley lake while tributary valley, back and supra lakes are sporadically present. One damming is attributable to the 1693 earthquake with certainty; another damming, to the same earthquake with high probability. Three dams were reincised, one breached or reincised, one is slightly reincised and two more or less intact; correspondingly, five silting up deposits were reincised, one is being reincised at present and two are still under formation. (literal)
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