Earthquake-driven acceleration of slow-moving landslides in the Colca valley, Peru, detected from Pléiades images

摘要: Abstract Major earthquakes in mountainous areas often trigger rapid landslides. Some observations also suggest that can damage landslide prone or cause slow-moving landslides to accelerate, with a risk of evolution the following months after earthquake. Here, we use optical images from Pleiades satellites detect and quantify effect on motion. We process multi-temporal acquired March, April, July 2013 over an area 210 km2 Colca valley (South Peru), obtain two Digital Elevation Models (DEM) three displacement fields area. The processed DEMs have uncertainty 0.6 m (1σ), order magnitude better than global freely available (GDEM-v2 SRTM), whereas between 0.11 0.18 m (1σ) both horizontal directions. Using these data, 9 compare their velocities during March–April April–July periods. find are highest wet season, which suggests strong groundwater control, highlight acceleration caused by regional Mw 6.0 major parameters controlling rock type distance source, suggesting friction at basal interface weeks earthquake is dependent shaking intensity.