A5056488344- Seismic Waves and Analysis
- Seismic Imaging and Inversion Techniques
- earthquake and tectonic studies
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Geological Modeling and Analysis
- Seismology and Earthquake Studies
- Geological and Geophysical Studies Worldwide
- Landslides and related hazards
- Geology and Paleoclimatology Research
- Geological formations and processes
- Geotechnical and Geomechanical Engineering
- Geological Studies and Exploration
- Methane Hydrates and Related Phenomena
- Karst Systems and Hydrogeology
- Geological Formations and Processes Exploration
- Drilling and Well Engineering
Centre National de la Recherche Scientifique
2021-2025
Université de Strasbourg
2023-2025
Institut Terre & Environnement de Strasbourg
2025
Institut des Sciences de la Terre
2021-2024
Université Savoie Mont Blanc
2021-2024
Université Gustave Eiffel
2021-2024
Université Grenoble Alpes
2021-2024
Institut de Recherche pour le Développement
2021-2023
Bureau de Recherches Géologiques et Minières
2021
SUMMARY A full understanding of the dynamics mountain ranges such as Alps requires integration available geological and geophysical knowledge into a lithospheric-scale 3-D model. As first stage in construction this geo-model, we derive new shear wave velocity model Alpine region, with spatial resolution few tens kilometres, making it possible to compare maps. We use four years continuous vertical-component seismic noise records compute correlations between more than 950 permanent broad-band...
Abstract In collision belts, the first-order role of mantle in localizing deformation has remained elusive, as resolution geophysical imaging remains too low to constrain crustal geometry. To address this issue, we geologically interpret a recent high-resolution shear-wave velocity model from ambient-noise tomography Western Alps. We show that lower Alpine geometry is highly variable at depth, evolving preserved European slab South smooth root North. Moho morphology controlled by numerous...
Abstract Taking benefit of the AlpArray temporary network and permanent networks in W‐Europe, we construct a 3‐D onshore‐offshore velocity model crust upper mantle using ambient‐noise wave‐equation tomography. We use frequency‐dependent phase traveltime misfit function an iterative procedure to refine recent V s computed from Bayesian two‐step ambient noise Observed waveforms consist vertical‐component correlations 600 broadband stations Alps surroundings, including ocean‐bottom seismometers...
Elastic full-waveform inversion (FWI) is appealing for an enhanced integration of wave physics propagation and the resulting improved characterization subsurface due to reconstruction P- S-wave velocity models. While high computational cost elastic FWI can be controlled using adequate numerical methods, increase in nonlinearity calls dedicated strategies design initial models access low-frequency data. We believe that recent surge ocean-bottom sensor acquisition opportunity develop such...
ou non, émanant des établissements d'enseignement et de recherche français étrangers, laboratoires publics privés.
Abstract We derive a three‐dimensional shear‐wave velocity model of the Ligurian‐Provence back‐arc basin (Northwestern Mediterranean Sea) using ocean‐bottom seismometers (AlpArray OBSs) and land stations from permanent temporary seismic networks. The quality OBS continuous records is enhanced by specific processing that reduces instrumental seabed‐induced noises (transients, tilt, compliance). To further improve resolution ambient‐noise tomography in offshore area, we compute Rayleigh‐wave...
Abstract Recent geophysical campaigns in the Alps produce images with seismic property variations along slab of sufficiently fine resolution to be interpreted as rock transformations. Since reacting European lower crust is presumed responsible for velocities at top Alpine slab, we sampled local analogs crustal lithologies field and modeled evolution equilibrium properties during burial, possible pressure‐temperature paths portion slab. The results are then compared range S ‐wave obtained...
Constraining the relative roles of erosion and tectonics in evolution mountain belts is a challenging scientific goal. In this review article on Western Alps, we show how it becomes possible to “bridge gap” between long–term (>Ma) orogenic controlled by exhumation processes recent geomorphological that accessible an annual–decadal basis. Advances mineral dating have grown relation deformation ductile brittle crustal fields allowed us constrain through time depth. A drastic change from...
We investigate both the deep crustal structure of Western and Central Alps orogenic wedge timing amount convergence accommodated since 32 Ma. The new structural interpretations are based on most recent geophysical models (Vs Vp tomography mainly) coupled to geological surface information. show that first-order similarities in collision kinematics can be described from Alps. After subduction-collision transition (37-32 Ma), around Ma until 22-20 Ma, shortening consists distributed deformation...
Recent ambient noise Vs tomography data at the scale of Western Alps (Nouibat et al., 2022) highlight deep structure chain. In European foreland, seismological model shows a crust normal thickness, with slow velocities (
Reactivation processes play a significative role in the localization of deformation but still remain hard to establish at lithospheric scale. In this work, we built 3D structural model, which enables bridge gap between main tectonic structures observed surface and geometry major interfaces (the Moho top basement) inferred by geophysical data acquired external Western Alps their foreland. The these is interpreted relation geodynamic evolution. results study highlight: (1) strong contribution...
<p><span>We have successfully derived a new </span><span>3-D</span><span> high resolution shear wave velocity model of the crust and uppermost mantle large part W-Europe from transdimensional</span><span><strong> </strong></span><span>ambient-noise tomography. This is intended to contribute development first crustal-scale...
We provide new interpretations of the most recent geophysical models (Vs and Vp tomography mainly) coupled to geological surface information. show that along-strike significant differences, but also first-order similarities in collision kinematics can be described from Western Central Alps. Moreover, new, precise shortening estimates are obtained, giving some realistic convergence rates since 35 Ma.In both Alps, after subduction-collision transition (37-32 Ma), orogen evolved a doubly...
<div> <p>The objective of the present study is to use potential lithologic analogues sampled in European crust units exhumed Alps predict seismic properties buried continental panel. To this end, from chemical compositions representative rock samples, we calculate velocities (Vp, Vs or Vp/Vs) at any P and T, under assumption that rocks have completely re-equilibrated during burial.</p> sample catalog comprehend (1) mafic intercalations, Variscan...
<p>The CIFALPS receiver-function (RF) profile in the southwestern Alps provided first seismological evidence of continental subduction Alps, with detection waves converted on European Moho at 75-80 km depth beneath western edge Po basin (Zhao et al., 2015). To complement and enhance our knowledge lithospheric structure Western we installed CIFALPS2, a temporary network 55 broadband seismic stations that operated for ~14 months (2018-2019) across North-Western 2018). The...
<p>The recent S-wave velocity tomography undertaken at the scale of Alps by Nouibat et al. (2021) allows a reappraisal deep structure this mountain belt. These geophysical data highlight role crustal geometry in strain field development observed Western Alps. The imagery shows standard thickness foreland, with slow velocities (<3.6 km.s<sup>-1</sup>) lower crust. occurrence sharp Moho offset 5-12 km is detected beneath External Crystalline...