Gilbert Ferhat

  • Research activities at ITES, Institut Terre et Environnement de Strasbourg
  • UMR7063/CNRS University of Strasbourg, France.

Research interests

  • Geodetic monitoring of surface deformation using GPS and classical surveying techniques.
  • Applications to tectonic deformation, geothermal sites monitoring and landslides monitoring (

Lectures in Geodesy

  • Geodesy : terrestrial and physical geodesy
  • Mapping and projections
  • Introduction to Surveying Engineering techniques
  • Introduction to cartography and mapping (BS level)
  • Space Geodesy, GPS (Master)
  • GPS positioning for geographers (Master)

Selected recent publications and communications

J.-F. Girard, S. Coutterand, G. Ferhat, M. Cara, F. Cara (2022)
Un témoin des fluctuations de la Mer de Glace durant l’Holocène : la Côte du Piget en vallée de Chamonix. Revue Quaternaire, 32 (4), 2021, p. 239-252.

Chaffaut Q, Lesparre N., Masson F., Hinderer J., Viville D., Bernard J.-D., Ferhat G. and Cotel S. (preprint 2021)
Hybrid Gravimetry to Map Water Storage Dynamics in a Mountain Catchment. Front. Water 3:715298. doi: 10.3389/frwa.2021.715298

Abi-Nader A., J. Albaric, M. Steinmann, J.-P. Malet, B. Pohl, B. Fores, A. Marchand, C. Geley, M. Gros, K. Susanto, G. Ferhat, V. Stefani, A. Boetsch, D. Pellecuer, M. Rega, C. Fontaine, H. Celle-Jeanton & C. Sue (2021) Seismic and hydro-geophysical monitoring in the Jura mountain. 5èmes Rencontres Scientifiques et Techniques Résif, Nov 2021, Obernai (67210), France. ⟨10.5802/crgeos.69⟩. ⟨hal-03442422⟩

Gance J., O. Leite, M. Lajaunie, K. Susanto, C. Truffert, O. Maillard, C. Bertrand, G. Ferhat, J.-P. Malet (2021).
Dense 3D electrical resistivity tomography to understand complex deep landslide structures,
the 23rd EGU General Assembly, held online 19-30 April, 2021.

Lajaunie M., C. Broucke, J.-P. Malet, C. Hibert, G. Sénéchal, D. Rousset, G. Ferhat (2021)
Dense 3D seismic traveltime tomography to understand complex deep landslide structures.
EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-9891,, 2021.

G. Ferhat, H. Rouillon, J.-P. Malet (2020)
Analysis of atmospheric refraction on Electronic Distance Measurements applied to landslide monitoring
8th INGEO International Conference on Engineering Surveying & 4th SIG Symposium on Engineering Geodesy, from October 22-23, 2020.

C. R. Moraila Valenzuela, G. Ferhat (2020)
Using high-sensitivity receivers for differential GPS positioning
8th INGEO International Conference on Engineering Surveying & 4th SIG Symposium on Engineering Geodesy, from October 22-23, 2020.


Publications in 2019

  • M Lajaunie, J Gance, P Nevers, J-P Malet, C. Bertrand, T Garin, G Ferhat (2019) Structure of the Séchilienne unstable slope from large-scale three-dimensional electrical tomography using a Resistivity Distributed Automated System (R-DAS). Geophysical Journal International, Oxford University Press (OUP), 219 (1), pp.129-147. ⟨10.1093/gji/ggz259⟩. ⟨hal-02533456⟩


Publications in 2018

  • Portier N., J. Hinderer, U. Riccardi, G. Ferhat, M. Calvo, Y. Abdelfettach, J.D. Bernard (2018)
    New results on the gravity monitoring (2014–2017) of Soultz‑sous‑Forêts and Rittershofen geothermal sites (France), 6, (1) Geothermal Energy. DOI: 10.1186/s40517-018-0104-5
  • Portier N., J. Hinderer, U. Riccardi, G. Ferhat, M. Calvo, Y. Abdelfettah, C. Heimlich, J.-D. Bernard (2018)
    Hybrid gravimetry monitoring of Soultz-sous-Forêts and Rittershoffen geothermal sites (Alsace, France), Geothermics, Volume 76, 2018, Pages 201-219, ISSN 0375-6505,
  • Walpersdorf A., L. Pinget, P. Vernant, C. Sue, A. Deprez, and the RENAG team :
    RENAG team : S. Baize, P. Bascou, S. Baudin, O. Bock, P. Briole, J. Cali, J.-P. Cardagliaguet, C. Champollion, O. Charade, J. Chéry, N. Cotte, O. Dauteuil, E. Doerflinger, T. Duquesnoy, S. Durand, R. Fages, G. Ferhat, M. Flouzat, B. Garayt, M. Gay, M. Gravelle, M. Guichard, J. Hinderer, F. Jouanne, C. Lallemand, F. Masson, E.-R. Mathis, S. Mazzotti, J.-L. Menut, F. Moreau, L. Morel, J. Nicolas, J.-M. Nocquet, L. Ott, F. Perosanz, T. Person, E. Poirier, A. Rigo, L. Rolland, A. Santamaria-Gomez, S. Saur, O. Scotti, A. Socquet, P. Ulrich, J. Van Baelen, M. Vergnolle, M. Vidal, C. Vigny, T. Villemin, G. Wöppelmann, (2018)
    Does Long-Term GPS in the Western Alps Finally Confirm Earthquake Mechanisms?
    Tectonics, 37, 3721–3737.


Communications in 2018 and 2019

  • Portier N., J. Hinderer, U. Riccardi, Y. Abdelfettah, G. Ferhat, V. Drouin, F. Sigmundsson, F. Schäfer, P. Jousset, K. Erbas, I. Magnusson, G.P. Hersir, K. Ágústsson, E. De Zeeuwvan Dalfsen, Á. Guðmundsson, J.-D.Bernard (2019)
    Time-lapse micro-gravity monitoring of geothermal reservoirs in Alsace (France) and Iceland. IUGG. Montréal, Canada.
  • Nolwenn Portier, Jacques Hinderer, Umberto Riccardi, G. Ferhat, Marta Calvo, Yassine Abdelfettah, Jean-Daniel Bernard (2018)
    Microgravity monitoring of the Soultz-sous-Forêts and Rittershoffen geothermal reservoirs (Alsace, France). EGW 2018, Strasbourg, October 2018.
  • Moraila Valenzuela C. R., G. Ferhat, C. de Lacy (2019)
    High rate GPS and seismological data to monitor coseismic deformation of the Peninsula of Baja California, Mexico. Joint International Symposium on Deformation Monitoring, Athens, Greece. 15 - 17 May 2019.
  • Ferhat G., M. Benbachir, J.-P. Malet, P. Boetzlé, P. Maisse, M. Vidal, B. Vial, P. Ulrich (2019)
    Processing strategy of Continuous GPS (cGPS) observations for the French Landslide Observatory OMIV. Joint International Symposium on Deformation Monitoring, Athens, Greece. 15 - 17 May 2019.
  • Point J., J.-P. Malet, M. Desrues, R. Kromer, G. Ferhat (2019)
    Terrestrial Laser Scanning time series for landslide advanced analysis. Joint International Symposium on Deformation Monitoring, Athens, Greece. 15 - 17 May 2019.

And some more ...

- Cara M. et G. Ferhat (2017) Une mission de lever topographique dans la vallée de Chamonix révèle les traces du Petit Age Glaciaire. Lettre de l'EOST - page 7.

- G. Ferhat, J.-P. Malet, A. Puissant, E. Hubert & M. Peyron (2017) Geodetic monitoring of the Adroit landslide, Barcelonnette, French Southern Alps. INGEO International Conference on Engineering Surveying, Lisbon, Portugal. 18-20 October 2017. ISBN 978-972-49-2300-0

- Malet, J.-P., G. Ferhat, P. Ulrich, P. Boetzlé, J. Travelletti (2016) The French National Landslide Observatory OMIV – Monitoring surface displacement usingpermanent GNSS, photogrammetric camerasand terrestrial LiDAR for understanding the landslide mechanism. Joint International Symposium on Deformation Monitoring, Vienna - Austria.

- G. Ferhat, V. Patoine, E. Clédat (2014) Leveling network for surface deformation monitoring along Soultz-sous-Forêts and Rittershoffen geothermal sites, France.   October 2014, European Geothermal Workshop. Karlsruhe, Germany.

- Gendre T., G. Ferhat, J. Hinderer, B. Cappleaire, E. Le Breton (2011) Evaluation of erosion at Wankama site (Niger) by comparaisons of different DEM, Revue de l'Association Française de Topographie.

- Gegout, P., Boy, J.P., Hinderer, J., G. Ferhat (2010). Modeling and Observation of Loading Contribution to Time-Variable GPS Sites Positions. In: Mertikas, S. (eds) Gravity, Geoid and Earth Observation. International Association of Geodesy Symposia, vol 135. Springer, Berlin, Heidelberg.

- Ruiz A.M., G. Ferhat, P. Alfaro, C. Sanz de Galdeano, M.C. de Lacy, G. Rodrı́guez-Caderot, A.J. Gil (2003) Geodetic measurements of crustal deformation on NW–SE faults of the Betic Cordillera, southern Spain, 1999–2001,
Journal of Geodynamics, Volume 35, Issue 3, 2003, Pages 259-272, ISSN 0264-3707,