Casalabate is a coastal small town frequently affected by sinkhole events. The first noticed event occurred on 1993 and caused several destructions of buildings. In the same year, a sinking of a small portion of emerged beach happened (Delle Rose and Federico, 2002). Four years later a collapse affected the submerged portion of beach and allowed the formations of a submarine spring, since then the bathing was forbidden for some weeks. Two episodes of sinkhole on the emerged beach occurred during 2000 and 2004, along a strike no longer than 30 meters. Each of they caused on surface short-lived elliptical depression quickly filled by sand. All the aforementioned episodes occurred inside a narrow area (about 250 m long and 100 m wide) close to the coast and oriented according to a north-north-east - south-south-west tectonic structures system (Delle Rose and Leucci, 2010). Further episodes occurred on March 2010, November 2010 and March 2011. The last noticed sinkhole happened on 7 January 2012. Usually the sinkholes occurred during or after rains or sea storms and each episode lasts some minutes at least. Due to geological and geotechnical uncertainties, Casalabate became an intriguing case study of sinkhole hazard in urban areas and three geological-geophysical models were recently proposed to explain the ground-instability and to asses the related hazard (Delle Rose and Leucci, 2010; Calò et al., 2011; Margiotta et al., 2012). 3D geological model and new geophysical data here shown can contribute to an efficient predictive model taking into account the hydrogeology context. Moreover, some epistemological considerations had performed to improve the interdisciplinary exchange between geologists and geophysicists.
New data about the sinkhole hazard at Casalabate (Lecce province)
M Delle Rose;L De Giorgi;G Leucci
2013
Abstract
Casalabate is a coastal small town frequently affected by sinkhole events. The first noticed event occurred on 1993 and caused several destructions of buildings. In the same year, a sinking of a small portion of emerged beach happened (Delle Rose and Federico, 2002). Four years later a collapse affected the submerged portion of beach and allowed the formations of a submarine spring, since then the bathing was forbidden for some weeks. Two episodes of sinkhole on the emerged beach occurred during 2000 and 2004, along a strike no longer than 30 meters. Each of they caused on surface short-lived elliptical depression quickly filled by sand. All the aforementioned episodes occurred inside a narrow area (about 250 m long and 100 m wide) close to the coast and oriented according to a north-north-east - south-south-west tectonic structures system (Delle Rose and Leucci, 2010). Further episodes occurred on March 2010, November 2010 and March 2011. The last noticed sinkhole happened on 7 January 2012. Usually the sinkholes occurred during or after rains or sea storms and each episode lasts some minutes at least. Due to geological and geotechnical uncertainties, Casalabate became an intriguing case study of sinkhole hazard in urban areas and three geological-geophysical models were recently proposed to explain the ground-instability and to asses the related hazard (Delle Rose and Leucci, 2010; Calò et al., 2011; Margiotta et al., 2012). 3D geological model and new geophysical data here shown can contribute to an efficient predictive model taking into account the hydrogeology context. Moreover, some epistemological considerations had performed to improve the interdisciplinary exchange between geologists and geophysicists.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
