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Fig. 11 Orthophoto of the Cala Rossa western sector showing: open and estimated fractures, the 47 noise measurement stations and HVSR curves
grouped by different areas; for the unstable area (in the yellow frame) only the most significant HVSR curves are shown

Acknowledgements The field activities greatly benefited from the Burjánek J, Gassner-Stamm G, Poggi V, Moore JR, Fäh D (2010)
support of the entire staff of the “Area Marina Protetta Isole Egadi” and Ambient vibration analysis of an unstable mountain slope.
the “Cooperativa Galea”. Special thanks are due to Dr. Stefano Donati Geophys J Int 180(2):820–828
for his interest and courtesy. Burjánek J, Moore JR, Yugsi Molina FX, Fäh D (2012) Instrumental
evidence of normal mode rock slope vibration. Geophys J Int 188
(2):559–569
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