A5075918047- earthquake and tectonic studies
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Seismic Waves and Analysis
- Geological and Geophysical Studies
- Seismic Imaging and Inversion Techniques
- Geological formations and processes
- Flood Risk Assessment and Management
- Underwater Acoustics Research
- Geological and Geophysical Studies Worldwide
- Hydrology and Sediment Transport Processes
- Cryospheric studies and observations
- Landslides and related hazards
- Tropical and Extratropical Cyclones Research
- Seismology and Earthquake Studies
- Geophysics and Gravity Measurements
- Meteorological Phenomena and Simulations
- Earthquake Detection and Analysis
- Hydrology and Watershed Management Studies
- Computational Physics and Python Applications
- Geophysical and Geoelectrical Methods
- Geophysics and Sensor Technology
- Automated Road and Building Extraction
- Pacific and Southeast Asian Studies
- Groundwater and Watershed Analysis
Institut de physique du globe de Paris
2013-2024
Université Paris Cité
2013-2024
Centre National de la Recherche Scientifique
2005-2024
Observatoire des Sciences de l'Univers de la Réunion
2009-2024
Institut polytechnique de Grenoble
2024
Institut de Recherche pour le Développement
2024
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2024
Université Grenoble Alpes
2024
Institut des Géosciences de l'Environnement
2024
Écologie Marine Tropicale des Océans Pacifique et Indien
2011-2023
Since 2004 more than 7000 km of full-crustal reflection profiles have been collected across Australia to give a total 11 000 km, providing valuable new constraints on crustal structure. A further set hitherto unexploited results comes from 150 receiver functions distributed the continent, mostly portable sites. These data sets provide dramatic increase in coverage compared with previous studies, and reveal complex structure Australian continent considerable detail. comprehensive model for...
SUMMARY The brutal onset of seismicity offshore Mayotte island North the Mozambique Channel, Indian Ocean, that occurred in May 2018 caught population, authorities and scientific community off guard. Around 20 potentially felt earthquakes were recorded first 5 d, up to magnitude Mw 5.9. had little pre-existing knowledge seismic activity region due poor network coverage. During 2019, MAYOBS/REVOSIMA seismology group was progressively built between four French research institutions improve...
The Piton de la Fournaise basaltic volcano, on La Réunion Island in the western Indian Ocean, is one of most active volcanoes world. This volcano classically considered as surface expression an upwelling mantle plume and its activity continuously monitored, providing detailed information superficial dynamics edifice structure. Deeper crustal upper structure under surprisingly poorly constrained, motivating this study. We used receiver function techniques to determine a shear wave velocity...
Abstract Ocean wave activity excites seismic waves that propagate through the solid earth, known as microseismic noise. Here we use a network of 57 ocean bottom seismometers (OBS) deployed around La Réunion Island in southwest Indian to investigate noise generated secondary band tropical cyclone moved over network. Spectral and polarization analyses show microseisms strongly increase 0.1–0.35 Hz frequency approaches this is composed both compressional surface waves, confirming theoretical...
Upper-mantle flow beneath the South Pacific is investigated by analysing shear wave splitting parameters at eight permanent long-period and broad-band seismic stations 10 deployed in French Polynesia from 2001 to 2005 framework of Polynesian Lithosphere Upper Mantle Experiment (PLUME). Despite small number events rather poor backazimuthal coverage due geographical distribution natural seismicity, upper-mantle anisotropy has been detected all except Tahiti where two with 15 yr data show an...
We present two independent, automated methods for estimating the absolute horizontal misorientation of seismic sensors. apply both to 44 free-fall ocean-bottom seismometers (OBSs) RHUM-RUM experiment (http://www.rhum-rum.net/). The techniques measure 3-D directions particle motion (1) P-waves and (2) Rayleigh waves earthquake recordings. For P-waves, we used a principal component analysis determine motions (polarizations) in multiple frequency passbands. correct polarization deviations due...
We report measurements of long‐period P wave polarization ( pol ) in Australia and Tahiti made by combining modeling the deviation harmonic analysis. The analysis horizontal as a function event back azimuth may be used to obtain information about (1) sensor misorientation, (2) dipping discontinuities, (3) seismic anisotropy, (4) velocity heterogeneities beneath station. results from grid search using Snell's law suggest presence discontinuity stations CTAO CAN Australia. These are consistent...
Abstract Seismic records from La Réunion Island very broadband Geoscope station are investigated to constrain the link between 2007 eruptive sequence and related caldera collapse of Piton de la Fournaise volcano. Tilt estimated seismic reveals that three eruptions belong a single inflation‐deflation cycle. trend indicates small‐volume summit eruption 18 February occurred during phase continuous inflation started in January 2007. Inflation decelerated 24 days before second short‐lived, on 30...
Abstract The deployment of a seismic network along the Adélie and George V coasts in East Antarctica during period 2009–2012 provides opportunity to monitor cryoseismic activity obtain new insights on relationship between tidal cycles coastal glacier dynamics. Here we focus records from seismometer located rocky outcrop vicinity grounding line 35 km broad Mertz glacier, major outflow this region. We detect numerous icequakes (50,000 events within 10 months up 100 events/h) demonstrate their...
Early detection of the onset a caldera collapse can provide crucial information to understand their formation and thus minimize risks for nearby population visitors. Here, we analyse 2007 Piton de la Fournaise on La Réunion Island recorded by broadband seismic station. We show that this instrument ultra-long period (ULP) signals with frequencies in range (0.003-0.01 Hz) accompanied very-long (VLP) (between 0.02 0.50 prior during suggesting it is possible detect beginning at depth anticipate...
A temporary network of 10 broad-band seismic stations has been installed in French Polynesia for the Polynesian Lithosphere and Upper Mantle Experiment (PLUME). All were either on volcanic islands or atolls various archipelagos a manner which complements geographic coverage provided by regional permanent stations. The primary aim PLUME is to image upper mantle structures related plate motion hotspot activity. However, because its proximity all sites, ocean responsible high level noise data...
Ocean waves activity is a major source of microvibrations that travel through the solid Earth, known as microseismic noise and recorded worldwide by broadband seismometers. Analysis in continuous seismic records can be used to investigate sources oceans such storms, their variations space time, making possible regional global-scale monitoring wave climate. In order complete knowledge Atlantic Pacific sources, we analyse 1 yr data permanent stations located Indian basin. We primarily focus on...
Abstract Seismic stations are increasingly used to monitor river activity and quantify sediment transport during flood events. In tropical regions, cyclone‐induced floods often associated with heavy rain strong wind episodes, generating complex seismic records involving the simultaneous signature of water, sediment, rainfall wind. Hence, characterization is then required better decipher each process improve our understanding signature. this study, we investigate experimentally response using...
Abstract Volcano observatories (VOs) around the world are required to maintain surveillance of their volcanoes and inform civil protection aviation authorities about impending eruptions. They often work through consolidated procedures respond volcanic crises in a timely manner provide service community aimed at reducing potential impact an eruption. Within International Airways Watch (IAVW) framework Civil Aviation Organisation (ICAO), designated State Observatories (SVOs) asked operate...
Abstract Bedload transport can fluctuate considerably over relatively short periods of time and for a given quasi‐constant flow rate. What are the implications replacing fluctuating signal with smoothed when calculating bedload using averaged values, as is common practice? This question was investigated BedloadR code, which allows 1D calculation well Monte Carlo simulations new data set collected in Severaisse River (French Ecrins massif). Four equations (Camenen & Larson, 2005,...
Teleseismic receiver-functions and Rayleigh-wave dispersion curves are jointly inverted for quantifying S-wave velocity profiles beneath the active volcanic zone off Mayotte. We show that lithosphere in east-northeast quadrant is composed of four main layers, interpreted as edifice, crust with underplating, lithospheric mantle, asthenosphere, latter two presenting a low-velocity zone. The depths old (10–11 km) new Moho (28–31 coincide magma reservoirs evidenced by recent seismological...
Torsion oscillatory deformation experiments have been performed at high temperatures (600–170°C) and over a wide range of low frequencies (20–10−2 Hz) on fine-grained gabbronorite samples from the Oman ophiolite in order to determine shear wave attenuation as function temperature melt fraction. The specimens small uniform grain size (0.25–0.3 mm) do not contain secondary, hydrated minerals. Measurements internal friction (Q−1) were using forced torsion apparatus strains (∽10−7), with...
come from teaching and research institutions in France or abroad, public private centers.L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques niveau recherche, publiés ou non, émanant des établissements d'enseignement recherche français étrangers, laboratoires publics privés.