Abstract

A relevant part of the Assisi urban area (central Italy), built up after 1950 and located outside of the ancient town center, is interested by a landslide characterized by a rather slow rate of movement, which has caused important damages to buildings for an accumulation effect in the years. The movements of the soil surface have both a horizontal and a vertical component. For the monitoring of the landslide behaviour, the determination of the motion field and its evolution in time, a precision GNSS network has been established over the area since 1995, connecting by means of a baseline network the moving area with stable geologic formations located well outside (up to some km distance) of the landslide body. Further (1999), a leveling network has been added to improve the definition of the vertical component of the motion field. Surveys of both GNSS and leveling networks have been carried out in time, with an approximately annual cadence, until the actuality. Time series of coordinates and heights spanning along the observation period (1995-2010) are hence available for the network points.The Assisi landslide area has also been investigated by means of SAR: the data here presented derive from the analysis of Envisat data spanning in time from 2003 to 2010, thus with a 7-years overlapping with the GNSS and leveling surveys, which make possible a comparison.SAR data refer to scatter points which are numerous and well spread over the landslide area but almost never coinciding with the GNSS and leveling markers. Moreover, the type of movements which can be put into evidence are different: along an assigned direction (the LOS, Line Of Sight) from the SAR data, in 3 dimensions from GNSS, along the vertical direction from leveling. This paper presents a comparison of the SAR results with the GNSS data, from which the LOS component has been derived. The comparison has been made for each GNSS marker with the surrounding SAR scatters, trying to take into account local topological effects when possible. A good correspondence between the results of the different techniques has been found in many cases, and a deeper analysis of the movement field has been possible.

Autore Pugliese

• Bovenga Fabio

Tutti gli autori

• F. Radicioni; A. Stoppini; G. Fornaro; F. Bovenga; D. O. Nitti

Titolo volume/Rivista

Non Disponibile

Anno di pubblicazione

2012

ISSN

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ISBN

978-87-90907-98-3

Numero di citazioni Wos

Nessuna citazione

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Settori ERC

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