Page 3 - Iannucci_alii_2015

GNGTS 2015 SESSIONE 3. 2

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Fig. l - Geologica! and geomorphological setting of Cala Rossa Bay. a) Excerpt of Favignana geologica! map in
the Cala Rossa area (from Abate et al., 1997) and picture of cliff in the Cala Rossa western part that shows the
overlapping of the Lower Pleistocene carbonate grainstones on the Pliocene clay deposits. b) Orthophoto of the Cala
Rossa western part in which shows: the open fractures with related code, the estimated fractures, the three unstable
zones, the stable plateau area, the 25 noise measurement stations.
plateau area, were distinguished. The first zone includes the portion of the slope between the
edge of the cliff and the first main fracture (fl) where the rock mass is intensely joined by some
additional open cracks related to the stress release. This joint system produces several unstable
meter-scale rock blocks. The three deep cracks isolate two large blocks, which correspond to
the second and third unstable zone. Where visible, the main cracks have an aperture about
35 cm and a vertical displacement up to 60 cm. A stable plateau area is encountered moving
upslope from the third fracture f3.

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