A5084696189- Seismic Waves and Analysis
- Seismic Imaging and Inversion Techniques
- High-pressure geophysics and materials
- earthquake and tectonic studies
- Geophysics and Sensor Technology
- Seismology and Earthquake Studies
- Wind and Air Flow Studies
- Geological and Geochemical Analysis
- Geological and Geophysical Studies Worldwide
- Geophysics and Gravity Measurements
- Methane Hydrates and Related Phenomena
- Drilling and Well Engineering
- Geological and Geophysical Studies
- Meteorological Phenomena and Simulations
- Karst Systems and Hydrogeology
- Landslides and related hazards
Université Gustave Eiffel
2019-2024
Centre National de la Recherche Scientifique
2019-2024
Laboratoire de Géologie de Lyon : Terre, Planètes et Environnement
2022-2024
Université Claude Bernard Lyon 1
2022-2024
École Normale Supérieure de Lyon
2024
Planetary Science Institute
2024
University of California, Berkeley
2024
Institut des Sciences de la Terre
2019-2024
Université Savoie Mont Blanc
2019-2024
Institut de Recherche pour le Développement
2019
Abstract Inconsistencies between observations from long and short period seismic waves geochemical data mean craton formation evolution remains enigmatic. Specifically, internal layering radial anisotropy are poorly constrained. Here, we show that these inconsistencies can be reconciled by inverting cratonic Rayleigh Love surface wave dispersion curves for shear‐wave velocity using a flexible Bayesian scheme. This approach requires no explicit vertical smoothing only adds to layers where...
ou non, émanant des établissements d'enseignement et de recherche français étrangers, laboratoires publics privés.
SUMMARY Coda-Q is used to estimate the attenuation and scattering properties of Earth. So far focus has been on earthquake data at frequencies above 1 Hz, as high noise level in first second microseismic peak, possibly lower coefficient, hinder stable measurements frequencies. In this work, we measure map coda-Q period bands 2.5–5 s, 5–10 s 10–20 greater Alpine region using cross-correlations between station pairs, based from permanent seismic stations temporary AlpArray experiment. The...
SUMMARY Surface waves extracted from ambient noise cross-correlations can be used to study depth variations of azimuthal anisotropy in the crust and upper mantle, complementing XKS splitting observations. In this work, we propose a novel approach based on beamforming estimate Rayleigh wave phase velocities cross-correlations. This allows us identify remove measurements biased by front deformation due 3-D heterogeneities, properly uncertainties associated with observed velocities. second...
The presence of ponding slabs at the base mantle transition zone (600-700 km) has been well known for a long time and can be explained by changes in material properties related to phase around this depth. However, recent tomographic studies have shown stagnating larger depths 1000 km. While geodynamic simulations experiments provide different insights, seismic tomography is crucial constrain these models. More specifically, anisotropy particular interest understand dynamics because its...
Craton formation and evolution remains enigmatic because observations from long short period seismic waves geochemical data are inconsistent. For example, both internal layering radial anisotropy poorly constrained. By inverting cratonic Rayleigh Love surface wave dispersion curves for shear-wave velocity using a flexible Bayesian scheme, we show that these inconsistencies can be reconciled. Our methodology does not require any vertical smoothing only includes anisotropic layers where...
<p>Imaging azimuthal anisotropy from seismic noise cross-correlations is challenging, especially in very complex tectonic settings such as the Alps. In this region, focus has been mainly on retrieving using SKS-splitting data, but data does not provide strong depth constraints. work, we map of Rayleigh-wave velocity Alps cross-correlations. This initial study focusses waves at ~15 s period. The area divided into small zones for which all stations outside are used virtual...
<p>Noise cross-correlations provide a good azimuthal coverage, limited only by the distribution of noise sources and layout stations used. It is therefore promising method to constrain anisotropy. As consist mainly surface waves, they are especially sensitive crust depth constraints, as opposed SKS-splitting data that more upper mantle. We use AlpArray network well from permanent networks all across Europe perform time-domain beamforming on cross-correlations. The extent...