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Intrieri, Emanuele; Gigli, Giovanni; Nocentini, Massimiliano; Lombardi, Luca; Mugnai, Francesco; Fidolini, Francesco; Casagli, Nicola
Geomorphology, 07/2015, Volume: 241Journal Article
Sinkholes represent a natural risk that may hit catastrophically without clearly detectible precursors. However, they are often overlooked by people and administrators. Therefore sinkhole monitoring and associated early warnings constitute important research topics but, currently, only a few papers about sinkhole prediction can be found. In this paper an experience of sinkhole monitoring and early warning with GB-InSAR is described. The latter is a highly precise instrument that is able to produce displacement maps with metric spatial resolution. The described activities were carried out on Elba Island (central Italy), where karstified limestone set off the occurrence of nine sinkholes since 2008, all within less than 3000m2, causing major damage to an important road and many indirect losses. In 1year of monitoring two deforming areas were detected, and the point where a sinkhole was about to propagate to the street level was predicted, thus permitting the preventive closure of the road. The deformation area was larger than the hole generated by the sinkhole, thus showing a subsidence that continued for a prolonged time even after the cavity was filled up. The occurrence of a 1.5-m-wide sinkhole, undetected by the GB-InSAR, also showed the lower detection limit of the instrument. •On Elba Island (Italy) 9 sinkholes occurred since 2008 and represent a risk.•A GB-InSAR has been used for sinkhole monitoring and early warning.•The deformation measured permitted the forecast of the collapse of a sinkhole.
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