Casagli, Nicola

Pancioli, Valeria

Righini, Gaia

English

Florence Research

Geophysical Research AbstractsVol. 12, EGU2010-2676, 2010EGU General Assembly 2010© Author(s) 2010Updating landslide inventory maps using Persistent ScatterersInterferometry (PSI) in the Biferno River Basin (Central Italy)Gaia Righini, Valeria Pancioli, and Nicola CasagliUniversity of Firenze, Department of Earth Sciences, Firenze, Italy (gaia.righini@unifi.it)This work illustrates the contribution of Persistent Scatterers Interferometry (PSI) from radar satellites ERS andENVISAT for the updating of a pre-existing landslide inventory map: the main purpose is to change or confirmthe landslide state of activity and geometry and to identify new landslides. PSI results are integrated with opticalimages and ancillary data in a 1320 km2 wide river basin (Biferno Basin) located in the central-eastern part ofItaly: in particular a new contribution to the interpretation of persistent scatterers information is presented. Thegeological setting of the area, characterised by clay and alternated clayey, silty and sandy formation, that areaffected by slow landslides, fits very well with the use of radar data.The analysis is performed on results from the PSInSAR(™) (Permanent Scatterers SAR Interferometry) techniqueprovided by TeleRilevamento Europa. The updating is obtained through the integration of conventional photo-interpretation and the radar-interpretation chain; the information coming from radar-interpretation is the basis ofthe proposed method to evaluate the state of activity and the intensity of slow landslides. The interferometric dataprovide estimates of the mean yearly velocity referred to two distinct time intervals: historic ERS (1992-2001)and recent ENVISAT (2002-2007). The integration of the photo-interpretation gives a fundamental contributionto landslide mapping in particular in hilly and mountainous environments where there is a low density of radarbenchmarks.In field validation confirmed the results and the capabilities of multi-interferometric InSAR data, integrated andcoupled with conventional techniques, to support landslides investigation at regional scale thanks to the availablearchive of repeated satellite data which provide measurements of ground displacements with a millimeter scaleaccuracy.In the study area about 9% of the pre-existing landslide inventory has been modified by means of PS information,15% of which have changed the state of activity from dormant to active and 95 new landslides were detected.Almost all the landslides where the state of activity is changed to “active” involve urban areas and the road networkwhere the reliability of PSI is higher and the photo-interpretation is strongly limited by anthropic activity. TheENVISAT datasets have allowed us to detect many of the landslides that have been reactivated during the 2003exceptional and prolonged rainfalls and, possibly, after the 2002 earthquake.The methodology is tailored upon the user needs to identify landslides prone areas; in this case the user involvedwas the Italian National Civil Protection Department who gave a fundamental contribution in terms of requirementsand validation. We consider that this methodology and procedure is portable and suitable for different geologicaland geomorphological environments.This work was carried out in the framework of the Terrafirma project (www.terrafirma.eu.com) which is one of theinitiatives run by the European Space Agency under the Global Monitoring for Environment and Security (GMES)Service Element Program (GSE).

Updating landslide inventory maps using Persistent Scatterers Interferometry (PSI) in the Biferno River Basin (Central Italy)

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Updating landslide inventory maps using Persistent Scatterers Interferometry (PSI) in the Biferno River Basin (Central Italy)

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