Structural control on the kinematics of the deep-seated La Clapière landslide revealed by L-band InSAR observations

Romy Schlögel (1) , J.-P. Malet (1) , Cécile Doubre (2) , Thomas Lebourg (3)

1 IPGS - Institut de physique du globe de Strasbourg
2 IPGS - Institut de physique du globe de Strasbourg
3 GEOAZUR 7329 - Géoazur

The objective of this work is to document the deformation pattern of the deep-seated La Clapière landslide for the period 2007–2010 from the combination of L-band synthetic aperture radar (SAR) interferograms, ground-based total station measurements and identification of the slope geomorphological structures. The interferograms are calculated for pairs of ALOS/PALSAR images at a time interval of 46 days. The displacement field derived from the interferograms reveals a non-uniform displacement gradient from the top (subsidence) to the bottom (accumulation). Vertical velocities are calculated from the unwrapped phase values and are in good agreement with ground-based measurements. The results demonstrate the potential of L-band ALOS/PALSAR imagery for the monitoring of active landslides characterized by complex kinematic patterns and by important changes in the soil surface backscattering in time.

Domaines: Sciences de la Terre

Romy Schlögel, J.-P. Malet, Cécile Doubre, Thomas Lebourg. Structural control on the kinematics of the deep-seated La Clapière landslide revealed by L-band InSAR observations. Landslides, 2016, 13 (5), pp.1005-1018. ⟨10.1007/s10346-015-0623-0⟩. ⟨hal-02149621⟩