B. Fruneau et al., OBSERVATION AND MODELING OF THE SAINT-ETIENNE-DE-TINEE LANDSLIDE USING SAR INTERFEROMETRY, Tectonophysics, 265(3-4), 1996, pp. 181-190
Six different interferograms of the ''La Clapiere'' landslide were der
ived from ERS-1 SAR images during the period Aug. 20-Sept. 4, 1991. Th
e coherence of the associated images is shown to remain significant ov
er most of the surface of the landslide during the two weeks of the su
rvey. The interferograms are remarkably similar, and indicate steady-s
tate displacements over at least 12 days. The displacement field deriv
ed from the interferograms is shown to be characterized by a non-unifo
rm displacement gradient from top-to-bottom and reveals a significantl
y faster motion of the western parr of the landslide. The amplitude of
the motion deduced from interferometry is shown to be in good agreeme
nt with ground measurements. Finally, SAR interferometry is shown to b
e able to evidence small-scale instabilities which may not be observed
with discrete ground measurements.