, Volume 7, Issue 3, pp 291–301 | Cite as

Monitoring, prediction, and early warning using ground-based radar interferometry

  • Nicola Casagli
  • Filippo Catani
  • Chiara Del Ventisette
  • Guido Luzi
Original Paper


In order to define adequate prevention measures and to manage landslide emergencies, real-time monitoring is required. This paper presents two different applications of the remote sensing technique: the ground-based synthetic aperture radar interferometry, here proposed as a monitoring and early warning support for slope instability. Data acquisitions carried out through a ground-based synthetic aperture radar interferometer, operating in Ku band, installed in front of the observed slopes, are discussed. Two case studies, based on the use of the same apparatus (formerly developed by the Joint Research Center of the European Commission and by Ellegi-LiSALab srl), are reported: the first one concerns the monitoring of a large landslide, named Ruinon (Valfurva, Italy). The second one deals with the monitoring of the NW unstable slope in the Stromboli island aimed to implementing an early warning system. Acquired interferometric data are processed to provide displacements and velocity maps of the monitored area. The monitoring services ongoing on the Ruinon landslide and on Stromboli demonstrate the capability of this technique to operate in different operative settings (i.e., different phenomena and geological framework) and for different aims (monitoring for prevention, early warning, and emergency assessment). This methodology has also been proved by national and regional authorities of civil protection in order to provide a real-time monitoring for emergency management.


Landslides Interferometry Ground-based SAR Ruinon (Valfurva, Italy) Stromboli (Italy) 



This work has been partly sponsored by the National Civil Protection Department (DPC), in the framework of the Project, partially by PRIN Project 2007 (Development and validation of hydraulic and geological tools for supporting a Tsunami Early Warning System: implementation to the Stromboli landslide case) and partly from the Valfurva Municipality. The DPC is acknowledged for the support of the project and for the permission given for the publication. The authors are grateful to Dario Tarchi and Joaquim Fortuny-Guasch for their support to data processing and interpretation, to the Ellegi-Lisalab for providing the systems used for data acquisition and to Dr. Mannucci (ARPA-Lombardia) for making available rainfall data. Thanks are due to the staff of the Engineering Geology group of the Earth Science Department of the University of Florence, for their valuable and constant work.


  1. Agliardi F, Crosta G, Zanchi A (2001) Structural constraints on deep-seated slope deformation kinematics. Eng Geol 59(1–2):83–102CrossRefGoogle Scholar
  2. Amelung F, Jonsson S, Zebker H, Segall P (2000) Widespread uplift and “trapdoor” faulting on Galapagos volcanoes observed with radar interferometry. Nature 407:993–996. doi: 10.1038/35039604 CrossRefGoogle Scholar
  3. Antonello G, Casagli N, Farina P, Leva D, Nico G, Sieber AJ, Tarchi D (2004) Ground-based SAR interferometry for monitoring mass movements. Landslides 1:21–28CrossRefGoogle Scholar
  4. Antonello G, Casagli N, Catani F, Farina P, Fortuny-Guasch J, Guerri L, Leva D, Tarchi D, (2007) Real-time monitoring of slope instability during the 2007 Stromboli eruption through SAR interferometry. Proceedings of 1st NACL, Veil (Colorado)Google Scholar
  5. Antonello G, Tarchi D, Casagli N, Del Ventisette C, Guerri L, Luzi G, Mugnai F, Leva D (2008) Microwave interferometric sensors as a tool for space and time analysis of active volcano deformations: The Stromboli case Proceedings of the 2008 2nd Workshop on USE of Remote Sensing Techniques for Monitoring Volcanoes and Seismogenic Areas, USEReST 2008Google Scholar
  6. Bamler R, Just D (1993) Phase statistics and decorrelation in SAR interferograms. IGARSS Proc, 18-21:980–984 Tokyo (Japan)Google Scholar
  7. Barbieri M, Corsini A, Casagli N, Farina P, Coren F, Sterzai P, Leva D, Tarchi D (2004) Space-borne and ground-based SAR interferometry for landslide activity analysis and monitoring in the appennines of Emilia Romagna (Italy): Review of methods and preliminary results European Space Agency, (Special Publication) ESA SP (550), pp 463–470Google Scholar
  8. Berardino P, Costantini M, Franceschetti G, Iodice A, Pietranera L, Rizzo V (2003) Use of differential SAR interferometry in monitoring and modelling large slope instability at Maratea (Basilicata, Italy). Eng Geol 68(1–2):31–51CrossRefGoogle Scholar
  9. Bertolaso G, De Bernardinis B, Bosi V, Cardaci C, Ciolli S, Colozza R, Cristiani C, Mangione D, Ricciardi A, Rosi M, Scalzo A, Soddu P (2009) Civil protection preparedness and response to the 2007 eruptive crisis of Stromboli volcano, Italy. J Volcanol Geotherm Res 182:269–277CrossRefGoogle Scholar
  10. Canuti P, Casagli N, Ermini L, Fanti R, Farina P (2004) Landslide activity as a geoindicator in Italy: significance and new perspectives from remote sensing. Environ Geol 45:907–919CrossRefGoogle Scholar
  11. Casagli N, Farina P, Leva D, Tarchi D (2003) Application of ground-based radar interferometry to monitor an active rockslide and implications for emergency management. In: Hermanss R, Evans S, Scarascia Mugnozza G, Strom A (Eds) Massive Rock Slope Failure. NATO Science Series Book. Kluwer, 2003Google Scholar
  12. Casagli N, Farina P, Leva D, Tarchi D (2004) Landslide monitoring on the Stromboli volcano through SAR interferometry. Proceedings of 9th International Symposium on Landslides, Rio de Janeiro, BrasilGoogle Scholar
  13. Casagli N, Del Ventisette C, Mannucci G, La Rocca L, Ballini A, Antonello G, Fortuny-Guasch J, Tarchi D, Leva D (2008) Ground-based interferometry for monitoring inactive rockslide in the Italian Alps. Geophysical Research Abstracts, Vol.10, EGU2008-A-08818,2008 SRef-ID:1607-7962/gra/EGU2008-A-08818 EGU General Assembly 2008Google Scholar
  14. Casagli N, Tibaldi A, Merri A, Del Ventisette C, Apuani T, Guerri L, Fortuny-Guasch J, Tarchi D (2009) Deformation of Stromboli Volcano (Italy) during the 2007 crisis by radar interferometry, numerical modeling and field structural data. J Volcanol Geoth Res 182:182–200CrossRefGoogle Scholar
  15. Catani F, Casagli N, Ermini L, Righini G, Menduni G (2005a) Landslide hazard and risk mapping at catchment scale in the Arno River basin. Landslides 2(4):329–342CrossRefGoogle Scholar
  16. Catani F, Farina P, Moretti S, Nico G, Strozzi T (2005b) On the application of SAR interferometry to geomorphological studies: estimation of landform attributes and mass movements. Geomorphology 66(1–4):119–131CrossRefGoogle Scholar
  17. Colombo D, Farina P, Moretti S, Nico g, PratiC (2003) Land subsidence in the Firenze-Prato-Pistoia basin measured by means of spaceborne SAR interferometry, Geoscience and Remote Sensing Symposium, 2003. IGARSS ’03. Proceedings. 2003 IEEE InternationalGoogle Scholar
  18. Corsini A, Farina P, Antonello G, Barbieri M, Casagli N, Coren F, Guerri L, Ronchetti L, Sterzai P, Tarchi D (2006) Space-borne and ground-based SAR interferometry as tools for landslide hazard management in civil protection. Int J Remote Sens 27:2351–2369CrossRefGoogle Scholar
  19. Crosta GB, Agliardi F (2003) Failure forecast for large rock slides by surface displacement measurements. Can Geotech J 40:176–191CrossRefGoogle Scholar
  20. Dei Cas L (2006) An example of data’s analysis coming from the geological monitoring: Ruinon landslide in upper Valtellina (Sndrio). J Tech Envi Geol 3–4:5–19Google Scholar
  21. Farina P, Canuti P, Casagli N, Ferretti A, Marks F, Menduni G (2006a) Survey and geological characterisation of land subsidence phenomena in the Lucca plain (Italy) using PSInSAR. Geophys Res Abstr 8:07930Google Scholar
  22. Farina P, Colombo D, Fumagalli A, Marks F, Moretti S (2006b) Permanent Scatterers for landslide investigations: outcomes from the ESA-SLAM project. Eng Geol 88:200–217CrossRefGoogle Scholar
  23. Farina P, Avila-Olivera JA, Garduño-Monroy VH (2007a) Structurally controlled urban subsidence along the mexican volcanic belt (MVB) monitored by InSAR. Proc. ‘Envisat Symposium 2007’, Montreux, Switzerland 23–27 April 2007Google Scholar
  24. Farina P, Casagli N, Ferretti A (2007b) Radar-interpretation of InSAR measurements for landslide investigations in civil protection practices. First North American Landslide Conference, June 3–8, 2007.Vail, ColoradoGoogle Scholar
  25. Ferretti A, Prati C, Rocca F (2000) Nonlinear subsidence rate estimation using permanent scatterers in differential SAR interferometry. IEEE Trans Geosci Remote Sens 38:2202–2212CrossRefGoogle Scholar
  26. Fukuzono T (1985a) A new method for predicting the failure time of a slope failure: Proc. 4th Int. Conf. and Field Workshop on Landslides, Tokyo (Japan): 145–150Google Scholar
  27. Fukuzono T (1985b) A method to predict the time of slope failure caused by rainfall using the inverse number of velocity of surface displacement. J Japanese Landslide Soc 22:8–13Google Scholar
  28. Fukuzono T (1990) Recent studies on time prediction of slope failure. Landslide News 4:9–12Google Scholar
  29. Ghiglia DC, Romero LA (1994) Robust two-dimensional weighted and un-weighted phase wrapping that use fast transforms and interactive methods. J Opt Soc Amer 11:107–117CrossRefGoogle Scholar
  30. Hanssen RF, Tammy TM, Weckerth M, Zebker HA, Klees R (1999) High resolution water vapor mapping from interferometric radar measurements. Science 283:1297–1299CrossRefGoogle Scholar
  31. Kenyi LW, Kaufmann V (2003) Estimation of rock glacier surface deformation using SAR intreferometry data, IEEE Trans Geosci Remote Sens 41:1512–1515CrossRefGoogle Scholar
  32. Kimura H, Yamaguchi Y (2000) Detection of landslide areas using radar interferometry. Photogramm Eng Remote Sens 66(3):337–344Google Scholar
  33. Leva D, Nico G, Tarchi D, Fortuny-Guasch J, Sieber A (2003) Temporal analysis of a landslide by means of a ground-based SAR interferometer. IEEE Trans Geosci Remote Sens 41:745–751CrossRefGoogle Scholar
  34. Luzi G, Pieraccini M, Mecatti D, Noferini L, Guidi G, Moia F, Atzeni C (2004) Ground-based radar interferometry for landslides monitoring: atmospheric and instrumental decorrelation sources on experimental data. IEEE Trans Geosci Remote Sens 42(11):2454–2466CrossRefGoogle Scholar
  35. Luzi G, Pieraccini M, Mecatti D, Noferini L, Macaluso G, Galgaro A, Atzeni C (2006) Advances in ground based microwave interferometry for landslide survey: a case study. Int J Remote Sens 27(12):2331–2350CrossRefGoogle Scholar
  36. Pipia L, Fabregas X, Aguasca A Mallorqui JJ (2006) A Comparison of Different Techniques for Atmospheric Artifact Compensation in GB-SAR Differential Acquisitions. IGARSS’06, Denver, ColoradoGoogle Scholar
  37. Pritchard ME, Simons MA (2002) A satellite geodetic survey of large-scale deformation of volcanic centres in the central Andes. Nature 418:167–171. doi: 10.1038/nature00872, LetterCrossRefGoogle Scholar
  38. Reidel B, Walther A (2008) InSAR processing for the recognition of landslides. Advan Geoci 14:189–194CrossRefGoogle Scholar
  39. Righini G, Del Ventisette C, Costantini M, Malvarosa F, Minati F (2008) Space-borne SAR Analysis for Landslides Mapping in the Framework of the PREVIEW Project. Proceedings of the First World Landslide Forum, TokyoGoogle Scholar
  40. Rudolf H, Leva D, Tarchi D, Sieber AJ (1999) A mobile and versatile SAR system. Proceedings of IGARSS 1999, Hamburg, Germany, 28 June–2 July, 592–594Google Scholar
  41. Strozzi T, Farina P, Corsini A, Ambrosi C, Thüring M, Zilger J, Wiesmann A, Wegmüller U, Werner C (2005) Survey and monitoring of landslide displacements by means of L-band satellite SAR interferometry. Landslides 2:193–201CrossRefGoogle Scholar
  42. Tarchi D, Casagli N, Moretti S, Leva D, Sieber AJ (2003a) Monitoring landslide displacements by using ground-based radar interferometry: Application to the Ruinon landslide in the Italian Alps. J. Geophys. Res. 108(B8-2387):101–114Google Scholar
  43. Tarchi D, Casagli N, Fanti R, Leva D, Luzi G, Pasuto A, Pieraccini M, Silvano S (2003b) Landslide monitoring by using ground-based SAR interferometry: an example of application to the Tessina landslide in Italy. Eng Geology 68(1–2)Google Scholar
  44. Tarchi D, Casagli N, Fortuny-Guash F, Guerri L, Antonello G, Leva D (2009) Ground Deformation From Ground-Based SAR Interferometry. Learning from Stromboli and its 2002–03 eruptive crisis", Geophysical MonographGoogle Scholar
  45. Voight B (1988) Material science law applies to time forecast of slope failure. Landslide News 3:8–11Google Scholar
  46. Voight B (1989) A relation to describe rate-dependent material failure. Science 243(10):125–130Google Scholar
  47. Voight, B (2000) Structural stability of andesite volcanoes and lava domes: Philos. Trans. R. Soc. Lond., v. 358, p 1663–1703Google Scholar
  48. Zebker HA, Villasenor J (1992) Decorrelation in interferometric radar echoes. IEEE Trans Geosci Remote Sens 30:950–959CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Nicola Casagli
    • 1
  • Filippo Catani
    • 1
  • Chiara Del Ventisette
    • 1
  • Guido Luzi
    • 1
  1. 1.Department of Earth SciencesUniversity of FirenzeFlorenceItaly

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