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TitleMeasuring displacements of the Thompson River valley landslides, south of Ashcroft, BC, Canada, using satellite InSAR
AuthorJournault, J; Macciotta, R; Hendry, M T; Charbonneau, F; Huntley, DORCID logo; Bobrowsky, P TORCID logo
SourceLandslides vol. 15, 4, 2018 p. 621-636,
Alt SeriesNatural Resources Canada, Contribution Series 20182046
PublisherSpringer Nature
Mediapaper; on-line; digital
File formatpdf
ProgramPublic Safety Geoscience Terrestrial Landslides
Released2017 09 23
AbstractThe Thompson River valley, south of Ashcroft in British Columbia, Canada, has experienced several landslides since the mid-1800s. The national railways that run along the valley cross a number of these landslides. All the landslides occur in glacial deposits, typically sliding on weak clay layers. Some have failed rapidly to very rapidly and are currently inactive or showing deformation rates from a few millimeters to centimeters per year. An evaluation of satellite InSAR (Interferometric Synthetic Aperture Radar) using RADARSAT-2 images between September 2013 and November 2015 provides new insight into landslide displacements in the Thompson River valley. This information enhances the ongoing hazard management of unstable terrain. This paper presents the comparison of the InSAR measurements with other instrumentation (GPS and ShapeAccelArraysª -SAA) installed at one moving landslide and then addresses the extent and magnitude of the slope movements observed. InSAR was found to provide similar displacement values to those measured otherwise. The stable location showed displacements of +/?1Êmm with an average near zero during the whole monitoring period. Six areas of slope movement were identified within the study area, all within or adjacent to the footprints of past landslides. The average line of sight (LOS) displacement rates range between 11 and 39Êmm/year. Most of the landslides exhibited seasonal variations in velocity that corresponds to changes in river elevation in the valley.

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