Laurent Métral
A5056703847- Seismic Waves and Analysis
- earthquake and tectonic studies
- Seismology and Earthquake Studies
- Geological and Geochemical Analysis
- Seismic Imaging and Inversion Techniques
- Geological and Geophysical Studies Worldwide
- High-pressure geophysics and materials
- Geophysical and Geoelectrical Methods
- Geological Formations and Processes Exploration
- Geophysical Methods and Applications
- Geology and Paleoclimatology Research
- Earthquake Detection and Analysis
- Geological Modeling and Analysis
- Reservoir Engineering and Simulation Methods
- Seismic Performance and Analysis
- Masonry and Concrete Structural Analysis
- Structural Health Monitoring Techniques
- Methane Hydrates and Related Phenomena
- Geophysics and Gravity Measurements
Université Gustave Eiffel
2017-2024
Université Savoie Mont Blanc
2017-2024
Institut des Sciences de la Terre
2016-2024
Institut de Recherche pour le Développement
2017-2023
Centre National de la Recherche Scientifique
2017-2023
Université Grenoble Alpes
2017-2023
Abstract The Solfatara volcano is the main degassing area of Campi Flegrei caldera, characterized by 60 years unrest. Assessing such renewal activity a challenging task because hydrothermal interactions with magmatic gases remain poorly understood. In this study, we decipher complex structure shallow system performing first 3‐D, high‐resolution, electrical resistivity tomography volcano. 3‐D model was obtained from inversion 43,432 resistance measurements performed on an ~0.68 km 2 ....
In the Western Alps, a first Late Cretaceous to Eocene “Pyrenean-Provençal” compressive phase accommodating N-S shortening resulting from convergence between Africa and Eurasia is classically described. It followed by Neogene “Alpine phase” E-W shortening. Since this major tectonic change not explained modification of global Africa-Eurasia convergence, it should be instead more local causes, possibly subduction Ligurian Ocean that initiated in Oligocene beneath European Iberian plates....
SUMMARY To constrain seismic anisotropy under and around the Alps in Europe, we study SKS shear wave splitting from region densely covered by AlpArray network. We apply a technique based on measuring intensity, constraining well both fast orientation delay. Four years of teleseismic earthquake data were processed, 723 temporary permanent broad-band stations deployment including ocean-bottom seismometers, providing spatial coverage that is unprecedented. The applied automatically (without...
Summary We take advantage of the new large AlpArray Seismic Network (AASN) as part research initiative (www.alparray.ethz.ch), to establish a consistent seismicity-catalogue for greater Alpine region (GAR) time period 2016 January 1–2019 December 31. use data from 1103 stations including AASN backbone composed 352 permanent and 276 (including 30 OBS) temporary broad-band (network code Z3). Although characterized by moderate seismic hazard, European Alps surrounding regions have higher risk...
SUMMARY The Pannonian Basin, situated in Central Europe, is surrounded by the Alpine, Carpathian and Dinaric orogens. To understand its tectonic characteristics evolution, we determine a shear wave velocity model of crust, mantle lithosphere asthenosphere consistently jointly inverting Rayleigh phase velocities measured from earthquake (EQ) ambient noise (AN) data. For AN data, continuous waveform data were collected 1254 stations, covering an area within 9° centre Basin during time period...
SUMMARY We infer seismic azimuthal anisotropy from ambient-noise-derived Rayleigh waves in the wider Vienna Basin region. Cross-correlations of ambient field are computed for 1953 station pairs and periods 5 to 25 s measure directional dependence interstation Rayleigh-wave group velocities. perform analysis each period on whole data set, as well overlapping 2°-cells regionalize measurements, study expected effects isotropic structure, isotropic–anisotropic trade-offs. To extract that relates...
Abstract Superficial geological layers can strongly modify the surface ground motion induced by an earthquake. These so-called site effects are highly variable from one to another and still difficult quantify for complex configurations. That is why site-specific studies greatly contribute improve hazard prediction at a specific site. However, have historically been considered carry out in low-to-moderate seismicity regions. We present here seismological datasets acquired framework of...
Magma intrusions ascending through the upper crust induce a displacement of Earth’s surface, amplitude which  increases as magma approaches surface. Most geodetic observations ground displacements induced by transport are interpreted using static elastic models open dislocations or pressurized surfaces without any priori knowledge on surface shape intrusion. Furthermore, numerical currently developed for propagation fluid-filled cracks, which also elastic, do not generally...
Our project aims at designing and realizing an autonomous hydroacoustic measurement system (“Bubblephone”) allowing to passively monitor the bubbling activity in underwater or lake degassing areas. Hydroacoustic is usually measured by hydrophones of Ocean Bottom Seismometers (OBS) only low frequencies (1-100 Hz) a band disturbed turbulence, while emits energetic acoustic higher (~ 1 kHz) that depend on size bubbles. The station's functions are filter hydrophone signals...
<p>The Ubaye Region is a seismically active region in the Western Alps (France), regularly struck by seismic swarms characterized high number of small to moderate earthquakes, such as 2003–2004 or 2012–2015. While some earthquakes could be associated with known faults, character observations (high seismicity – low deformation rate) requires complex driving processes beyond local regional tectonics. Most conceptual models involve fluids...