A5072828605- Landslides and related hazards
- Cryospheric studies and observations
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Tree Root and Stability Studies
- Winter Sports Injuries and Performance
- Climate change and permafrost
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Nonlinear Optical Materials Research
- Arctic and Antarctic ice dynamics
- earthquake and tectonic studies
- Seismic Waves and Analysis
- Crystallography and molecular interactions
- Flood Risk Assessment and Management
- Seismology and Earthquake Studies
- Fire effects on ecosystems
- Geological Modeling and Analysis
- Satellite Image Processing and Photogrammetry
- Seismic Performance and Analysis
- Metal complexes synthesis and properties
- Photochromic and Fluorescence Chemistry
- Crystal structures of chemical compounds
- Remote Sensing in Agriculture
- Chemical synthesis and pharmacological studies
- Methane Hydrates and Related Phenomena
Université Grenoble Alpes
2016-2025
Université Gustave Eiffel
2016-2025
Institut de Recherche pour le Développement
2016-2025
Université Savoie Mont Blanc
2018-2025
Institut des Sciences de la Terre
2016-2025
Centre National de la Recherche Scientifique
2015-2025
Institut polytechnique de Grenoble
2022-2024
University of Oslo
2022
University of Birmingham
2022
Laboratoire de Chimie de Coordination
1998-2017
A deadly cascade catastrophic landslide in Uttarakhand state India on February 2021 damaged two hydropower plants, and more than 200 people were killed or are missing. Shugar et al. describe the of events that led to this disaster. massive rock ice avalanche roared down a Himalayan valley, turning into debris flow upstream from first plants. The sequence highlights increasing risk Himalayas caused by increased warming development. Science , abh4455, issue p. 300
Since the mid-1980s, there has been a growth of interest in search and development molecular second-order nonlinear optical (NLO) materials that possess various device applications. Beside most traditional donor-acceptor ("push-pull") organic chromophores (e.g. stilbene family), chemists have increasingly extended their field investigations to newer generations molecules greater complexity. In recent years, coordination complexes through unique characteristics such as redox magnetic...
Two new anil molecules exhibiting photochromism in the crystalline state, N-(4-hydroxy)-salicylidene-amino-4-(methylbenzoate) (2) and N-(3,5-di-tert-butylsalicylidene)-4-aminopyridine (3), are obtained. Upon irradiation UV, yellow crystals change color to red, owing enol-keto intramolecular tautomerism. The red disappears, when left dark or irradiated with visible light. 3 has most stable keto form among all anil-type photochromic compounds (τ = 460 days at room temperature). Both exhibit...
Abstract In tectonically active mountain belts, landslides contribute significantly to erosion. Statistical analysis of regional inventories earthquake-triggered-landslides after large earthquakes (Mw > 5.5) reveal a complex interaction between seismic shaking, landslide material, and rainfall. However, the contributions each component have never been quantified due lack in-situ data for landslides. We exploited 3-year geodetic dataset slow-moving in Peru affected by local seasonal...
The Sentinel-2 optical satellites provide a global coverage of land surfaces with 5-day revisit time at the Equator. We investigate ability these freely available images to detect precursory motions before rapid landslides. A 9-month time-series displacement is derived from data over major landslide in French Alps, which exhibited sudden reactivation June 2016. This analysis reveals 7-month period low activity (≤1 m), followed by acceleration 3.2 ± 1.2 m 3 days, failure mass about 2 3.6 106...
The Gorkha earthquake (Nepal, 2015, M w 7.9) triggered many landslides. most catastrophic mass movement was a debris avalanche that buried several villages in the Langtang valley. In this study, questions are raised about its volume and initiation. I investigate possibility of high-resolution digital surface models computed from tri-stereo SPOT6/7 images to resolve issue. This dataset enables me derive an inventory 160 landslides by earthquake. analyze source errors estimate uncertainties...
The Sechilienne rockslide, in the French Alps, has recently been instrumented with three seismic arrays. This network recorded numerous rockfalls and local microearthquakes. Because media is highly fractured, it difficult to identify pick first arrivals. Beam-forming methods were therefore used locate these events. method adapted take into account heterogeneity of wave velocities. location accuracy estimated be about 50 m for epicenters by applying calibration shots. Depth less constrained...
In mountainous environments, slow‐moving landslides (velocities <100 m/year) are a major concern for local populations. Rainfall is often the dominant forcing, and result in changes kinematics which can mask smaller signals related to internal forcings. We focus here on (>40 Mm 3 ) landslide desert of southern Peru take advantage this arid environment study processes affecting kinematics. first estimate ground displacement from time series analysis Landsat‐8 images, spanning 5.7‐year...
Monitoring snow avalanches is necessary in order to better understand their triggering mechanisms and ultimately improve forecast performance. Seismic monitoring has been developed by several groups over the last 20 years holds great potential detect, locate, characterize avalanches. During 2009–2010 winter, a seismic antenna was installed French Alps close village of Saint‐Christophe‐en‐Oisans (1700 m above sea level). The array seven sensors operated during 50 days October November 2009...
Earthquake is one of the dominant triggering factors landslides. Given wide areas covered by mega earthquake-triggered landslides, their inventory requires development automatic or semi-automatic methods applied to satellite imagery. A detection method here proposed for this purpose, fit with simple datasets; SPOT5 panchromatic images 5 m resolution coupled a freely and globally available DEM. The takes advantage multi-temporal detect changes based on radiometric variations after precise...
Abstract We document the first time series of a landslide reactivation by an earthquake using continuous GPS measurements over Maca (Peru). Our survey shows coseismic response about 2 cm, followed relaxation period 5 weeks during which postseismic slip is 3 times greater than displacement itself. results confirm activation landslides and provide observation displacement. These observations are consistent with mechanical model where on basal interface governed rate state friction, analogous...
Abstract. There are on average 35 fatal mountaineering accidents per summer in France. On average, since 1990, 3.7 of them have occurred every the Grand Couloir du Goûter, classic route up Mont Blanc (4809 m a.s.l.). Rockfall is one main factors that explain this high accident rate and contribute to making it most accident-prone areas Alps for mountaineers. In particular context, objective study document rockfall activity its triggering Goûter order disseminate results mountaineers favour...
Efficient NO photorelease is observed in <italic>cis</italic>(Cl,Cl)-[Ru<sup>II</sup>(FT)Cl<sub>2</sub>(NO)](PF<sub>6</sub>) and <italic>trans</italic>(Cl,Cl)-[Ru<sup>II</sup>(FT)Cl<sub>2</sub>(NO)](PF<sub>6</sub>) with a quantum yield of 0.31 0.10 respectively.
[1] Long-term observations of large active rockslides show accelerating deformation over many thousands years since the last deglaciation. The effect deglaciation on slope stability is however poorly understood due to (1) limited long-term and (2) a complex interaction between glacier retreat hydrogeological, mechanical, morphological processes. To assess sensitivity rockslide dynamics these different processes, model progressive damage through intact rock mass developed in this study, based...
Abstract The large slow‐moving landslide of Maca is located in the upper Colca valley (southern Peru), a region characterized by well pronounced rainy period, and intense recurrent sustained seismicity. landslide, developed deep lacustrine deposits, has recently accelerated, threatening village. This work aims at understanding rupture mechanism causes recent reactivation/acceleration. We present multidisciplinary characterization that includes: (i) geological morphological mapping field;...
Abstract The massive worldwide deglaciation leads to more frequent slope instabilities in mountainous terrains. physical processes leading such destabilizations are poorly constrained due little monitoring of dynamic parameters at the local scale. Here we study a very large slow‐moving landslide (∼0.8 km 2 ), on flank Tungnakvíslarjökull glacier Iceland. Based combination remote sensing images, monitor and kinematics over 75 years, with focus period 1999–2019 when rapid wastage has been...
Abstract In the days to weeks following an earthquake, landslides can display specific post-seismic motions, including delayed initiations and relaxations. These motions have uncertain origin, sometimes attributed specificities of landslide basal interface or fluid transports in shear zone. Here we address this question, by documenting co- slow-moving accelerated Gorkha earthquake (Mw 7.8, 25/04/2015, Nepal). We detect 11 over area 750 km $$^2$$ <mml:math...