A5107340239- earthquake and tectonic studies
- Landslides and related hazards
- Meteorological Phenomena and Simulations
- Tropical and Extratropical Cyclones Research
- Geological formations and processes
- Geological and Geochemical Analysis
- Earthquake Detection and Analysis
- Geological and Geophysical Studies Worldwide
- Coastal and Marine Dynamics
- Seismic Waves and Analysis
- Radioactive contamination and transfer
- Atmospheric and Environmental Gas Dynamics
- High-pressure geophysics and materials
- Atmospheric Ozone and Climate
- Radioactivity and Radon Measurements
- Ionosphere and magnetosphere dynamics
- Wind and Air Flow Studies
- Methane Hydrates and Related Phenomena
- Geophysics and Gravity Measurements
- Atmospheric chemistry and aerosols
- Geological and Geophysical Studies
- Climate variability and models
- Nuclear and radioactivity studies
- Geology and Paleoclimatology Research
- Ocean Waves and Remote Sensing
CEA DAM Île-de-France
2014-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2024
CEA Cadarache
2019-2022
CEA Grenoble
2019-2022
Laboratoire de Glaciologie et Géophysique de l’Environnement
2003-2006
The submarine flow slides and their hydraulic effects are studied by numerical means. These types of landslides assumed to separate into a dense close the bed turbulent dispersion above it. A two-dimensional fluid mechanics mixture model based on Navier-Stokes' equations has been developed study water waves generated these landslides. part is considered as viscoplastic fluid, whereas dispersed modeled an ideal fluid. rheological parameters comprise diffusion coefficient, Bingham yield...
Abstract High‐resolution, ground‐based and independent observations including co‐located wind radiometer, lidar stations, infrasound instruments are used to evaluate the accuracy of general circulation models data‐constrained assimilation systems in middle atmosphere at northern hemisphere midlatitudes. Systematic comparisons between observations, European Centre for Medium‐Range Weather Forecasts (ECMWF) operational analyses recent Integrated Forecast System cycles 38r1 38r2, NASA's...
Abstract. This paper presents an inverse method for inferring trace gas fluxes at high temporal (daily) and spatial (model grid) resolution from continuous atmospheric concentration measurements. The is designed regional applications use in intensive campaigns. We apply the to a one month inversion of over Europe. show that information added by measurements depends critically on smoothness constraint assumed among source components. initial condition affects 20 days, provided has enough...
This paper reviews recent progress toward understanding the dynamics of middle atmosphere in framework Atmospheric Dynamics Research InfraStructure Europe (ARISE) initiative. The atmosphere, integrating stratosphere and mesosphere, is a crucial region which influences tropospheric weather climate. Enhancing requires improved measurement propagation breaking planetary gravity waves originating lowest levels atmosphere. Inter-comparison studies have shown large discrepancies between...
Abstract The southern sector of Soufrière Hills Volcano failed on 26 December 1997 (Boxing Day), after a year disturbance culminating in devastating eruptive episode. Sector collapse produced c. 50 x 10 6 m 3 volcanic debris avalanche, and depressurized the interior lava dome, which exploded to generate violent pyroclastic density current. south-directed growth lobe build-up lava-block talus, since early November 1997, brought hydrothermally weakened condition marginal stability....
Abstract A new study of gravity waves produced by thunderstorms was performed using continuous recordings at the IS17 (Ivory Coast) infrasound station International Monitoring System developed for verification Comprehensive Nuclear Test‐Ban Treaty. typical case is presented a large thunderstorm on 10–11 April 2006 lasting near 14 h. Comparison with cloud temperature measured Meteosat 6 satellite shows that wave activity when low inside convection cells located over station. Statistics based...
Modest earthquakes may trigger large submarine landslides, responsible for disastrous tsunami waves, as demonstrated by the Papua New Guinea event of July 17, 1998. The relatively small earthquake was followed unexpectedly high up to 15 m, wiping out 3 villages and killing more than 2200 people. Numerical simulations show that seismic dislocation sources are not energetic enough reproduce observed along coast. Tsunami generation a landslide has been simulated finite‐difference model,...
The February 1996 Peruvian earthquake generated a larger tsunami than expected from its surface magnitude. This discrepancy as well the long rupture duration indicate that this event is ‘tsunami earthquake’. associated was strong locally with runup heights of 1 to 5 meters along coastline 400 km. It shown can be modeled for seismic moment 2.10 20 Nm, using rigidity 10 N/m². propagation solving wave equations by finite difference method. maximum run‐up in region Chimbote simulated grid...
Abstract. The devastating Mw 7.1 Haiti earthquake in 2010 was accompanied by local tsunamis that caused fatalities and damage to coastal infrastructure. Some were triggered slope failures of river deltas the close vicinity epicenter, while others, 30 50 km north across Bay Gonâve, are well explained reverse component coseismic ground motion this mostly strike-slip event. However, observations run-up heights up 2 m along southern coast island at distances 100 from as tide gauge DART buoy...
Research Article| July 01, 2002 A Field Survey of the 1946 Aleutian Tsunami in Far Emile A. Okal; Okal 1Department Geological Sciences, Northwestern University Search for other works by this author on: GSW Google Scholar Costas E. Synolakis; Synolakis 2Department Civil Engineering, Southern California Gerard J. Fryer; Fryer 3Hawaii Institute Geophysics Philippe Heinrich; Heinrich 4Département Analyse et Surveillance de l'Environnement, Commissariat à l'Énergie Atomique, France José C....
The islands in the Marquesas archipelago are most exposed to far‐field tsunamis French Polynesia. Four recent earthquakes located at Pacific rim (Kurile 1994, Chile 1995, Mexico 1995 and Peru 1996 earthquakes) generated trans‐Pacific caused contrasting inundations several inhabited Marquesian bays. aim of this study is better understand amplification phenomena observed Islands improve risk assessment. We present here numerical simulations these four by means a finite difference model solving...
We investigate the spatio‐temporal complexity of moment release February 21, 1996 Peru earthquake ( M w 7.5). use a non‐linear source tomographic technique, based on simulated annealing, to invert surface wave spectra for slip distribution gently dipping fault plane. The (5–65 mHz) are obtained using an empirical Green's function (EGF) method applied first and second orbit fundamental mode Rayleigh waves. Spectra well fit by 110 km bilateral rupture, subparallel trench, updip hypocenter,...
The evolution of the volcano activity in Montserrat could lead to collapse a portion lava dome Tar River Valley and sudden entry debris avalanche into Caribbean Sea. impact with volume 40 × 10 6 m³ sea generated tsunami have been simulated numerically by mixture model solving 3D Euler's equations. is composed sediments considered as an homogeneous fluid density 2 water. Numerical tests show that waves are sensitive both initial velocities fronts landslide. water surface calculated used input...
SUMMARY The 15 January 2022 eruption of the Hunga–Tunga volcano generated a Lamb pressure wave propagating all over globe and triggering tsunami throughout planet. A first atmospheric arrived 16 hr after on French Mediterranean coasts propagated southward. second one originating from Africa was observed 4 later with an attenuated amplitude. can be roughly defined either by N or sinusoid signal period close to 50 min amplitude 130 Pa. In Sea, recorded almost standard coastal tide gauges...
We present what is to our knowledge the first direct observation of deformation surface ocean upon passage a tsunami wave, on high seas, far from influence shorelines and continental shelves. use satellite altimetry data ERS‐1 TOPEX/POSEIDON programs, complemented by spectrogram techniques synthetic maregrams examine case seven recent tsunamigenic earthquakes. make positive identification wave field in 1992 Nicaraguan tsunami, which we detect at 15°S, 106°W, five hours after origin time....
SUMMARY On 18 March 2021 an earthquake of magnitude Mw = 6.0 occurred offshore the Algerian coasts and generated a tsunami with amplitudes smaller than few millimetres crossing western Mediterranean Sea. The objective this study is threefold: first, to determine whether seismic sources calculated in context early warning are relevant; secondly, simulations able reproduce tide-gauge observations thirdly, define sensitivity grid resolutions parameters. In Sea, very small number available...
Although a few historical tsunamis have occurred in the Lesser Antilles region, their characteristics are poorly documented due to ephemeral nature of associated signatures. Recently, tsunami was generated following magnitude Mw 6.3 earthquake that on 21 November 2004 between Guadeloupe and Dominica. This one two largest earthquakes recorded this area last century. A field survey allowed us characterize which affected Les Saintes, southern coast Basse‐Terre (Guadeloupe) northern We used...
Abstract. In this work we perform numerical simulations of convective gravity waves (GWs), using the WRF (Weather Research and Forecasting) model. We first run an idealized, simplified highly resolved simulation with model top at 80 km. Below 60 km altitude, a vertical grid spacing smaller than 1 is supposed to reliably resolve effects GW breaking. An eastward linear wind shear interacts field generated by single thunderstorm. After 70 min integration time, averaging within radius 300 from...