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Accueil > La Formation > Formations universitaire > Masters > Stages de master > Terre Solide > Combined effect of the Mw7.9 Gorkha - Mw 7.2 earthquakes sequence, and the 2015 monsoon on the triggering of rapid and slow-moving landslides.




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Terre Univers Environnement

Combined effect of the Mw7.9 Gorkha - Mw 7.2 earthquakes sequence, and the 2015 monsoon on the triggering of rapid and slow-moving landslides.

par Encadrants de stages - 11 octobre 2017

Laboratoire : ISTERRE
Encadrants : P. Lacroix
Mots clés Thématiques et Méthodes : landslides, earthquake triggering, optical images, stereo images, DEM, image correlation
Lieu du stage : Isterre Grenoble
Contact email : pascal.lacroix@univ-grenoble-alpes.fr

The two main chocks of April-May 2015 earthquakes in Nepal have caused a large number of casualties and destruction. About 20% of the casualties results because of numerous co-seismic avalanches and landslides that triggered village burial. Despite the societal importance of this phenomenon, the influence of seismic shaking on shallow bedrock fracturing and its increased sensitivity to landsliding remain insufficiently documented and quantified. The Gorkha earthquake provides therefore a rare opportunity to study the impact of a large continental earthquake combined with monsoons seasons on steep slopes destabilisation.
During this stage, we will measure topographic changes and the deforming hillslopes using differential high resolution DEMs, and subpixel correlation techniques, and making the physical link with rainfalls and major earthquakes. All the data will be processed from high resolution stereo Pléiades images available on an area of 1200km2 at different dates. Inventories of rapid and slow-moving landslides will be realized and analyzed in regards with the seismic source parameters.


       

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