Full text loading...
-
Mudslide-bedrock Interaction at Super-Sauze (French Alps) by UAV-based Remote Sensing and Nanoseismic Monitoring
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Near Surface 2010 - 16th EAGE European Meeting of Environmental and Engineering Geophysics, Sep 2010, cp-164-00049
- ISBN: 978-90-73781-88-7
Abstract
The Super-Sauze (French Alps) mudslide was observed by high-resolution aerial photography from UAV (unmanned Aerial Vecicle) and Nanoseismic Monitoring in 2008. Remote sensing could resolve mudslide movement, and different types of superficial fissure patterns. Nanoseismic Monitoring identified seismic event types of ‘rockfall’, ‘fracture’ and ‘scratch’. The spatial distribution of the 'fracture' epicenters and ‘scratch’ source areas indicate the generation of these events close to the 'in-situ' crests of bedrock topography, most of them hidden below the mudslide material today. Seismic source areas correlate to the spatial distribution of observed fissure patterns which diverse into extension and shear fissures of varying size, and to secondary scarps. The superficial fissure patterns reside at stable position despite the moving mudslide; their spatial distribution, dimension, shape and orientation relates directly to the in-situ crests and the lateral bedrock boundaries. Our hypothesis from joint analysis of both observation data is that ‘fracture’ impulses are induced by brittle failure of the uppermost, dried mud layer, while ‘scratch’ sequences are initiated by “scratching” and “grinding” of single rock particles within the mudslide against the hard rock in-situ crests.