Geophysical surveys to study a landslide body (north-eastern Sicily)

Two field surveys, performing recordings of environmental noise combined with a MASW survey were carried out in 2010/11 and 2015. in an area affected by landslide, near the village of Tripi (Messina) (Fig. 1a). The Tripi area is greatly affected by instability phenomena triggered by intense rainfalls on the particular geological and morphological characteristics of the territory, characterized by very steep slopes (Fig. 1b).The Tripi country with its hamlet ―Casale‖ are among the centers, in Sicily, at higher hydrogeological risk, since the landslides and rockfalls that often mobilize, put at risk the population and the structures (P.A.I.- Hydrographic basin of the Mazzarrà creek). The landslide studied in this work activated on December 14th, 2009, just north of the Tripi village, threatening the main road between this center and its hamlet Casale, the landslide then re-activated again on February 21st, 2012. On December 22nd, 2010 and January 18th, 2011, 36 measures of noise were carried out. They were located along 3 different profiles within the landslide body arranged orthogonal to the movement direction, and a MASW survey located near the profile performed at lower altitude. During the second field survey performed on April 28th, 2015, 34 environmental noise recordings on 3 profiles were acquired; two section partially mark those performed 5 years earlier and, even in this case, an investigation MASW. The main purpose is to obtain information for the geometric reconstruction of the landslide slip surface and to observe the possible variations over time.