A5043686501- Geological and Geochemical Analysis
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Seismic Imaging and Inversion Techniques
- Landslides and related hazards
- Hydrocarbon exploration and reservoir analysis
- Geological Studies and Exploration
- Geology and Paleoclimatology Research
- Geotechnical and Geomechanical Engineering
- Cryospheric studies and observations
- Geological formations and processes
- Geological and Tectonic Studies in Latin America
- Theoretical and Computational Physics
- Geomagnetism and Paleomagnetism Studies
- Geological Modeling and Analysis
- Earthquake Detection and Analysis
- Geological and Geophysical Studies Worldwide
- Seismology and Earthquake Studies
- Reservoir Engineering and Simulation Methods
- Drilling and Well Engineering
- Mining and Gasification Technologies
- Tropical and Extratropical Cyclones Research
- Masonry and Concrete Structural Analysis
- Meteorological Phenomena and Simulations
- Geological and Geophysical Studies
Géosciences Montpellier
2015-2024
Université de Montpellier
2015-2022
Centre National de la Recherche Scientifique
2011-2022
Cardiff University
2013-2015
Imperial College London
2013-2015
Institut de physique du globe de Paris
2011-2014
Université Paris Cité
2011-2014
Sorbonne Paris Cité
2011-2014
Abstract Transition zone slab deformation influences Earth's thermal, chemical, and tectonic evolution. However, the mechanisms responsible for wide range of imaged morphologies remain debated. Here we use 2‐D thermo‐mechanical models with a mobile trench, an overriding plate, temperature stress‐dependent rheology, 10, 30, or 100‐fold increase in lower mantle viscosity, to investigate effect initial subducting overriding‐plate ages on slab‐transition interaction. Four subduction styles...
Abstract Prediction of the emplacement volcanic mass flows (lava flows, pyroclastic density currents, debris avalanches and flows) is required for hazard risk assessment, planning risk-mitigation measures. Numerical computer-based models now exist that are capable approximating motion a given volume material from its source to deposition area. With these advances in technology, it useful compare various codes order evaluate their respective suitability real-time forecasting, preparedness...
Abstract. We present an extensive parametric exploration of the feasibility “spontaneous” subduction initiation, i.e., lithospheric gravitational collapse without any external forcing, at a transform fault (TF). first seek candidates from recent initiation events oceanic TF that could fulfill criteria spontaneous and retain three natural cases: Izu–Bonin–Mariana, Yap, Matthew Hunter. next perform conditions allowing for sinking older plate using 2-D thermomechanical simulations. Our study...
Management of eruptions requires a knowledge lava effusion rates, for which safe thermal proxy is often used. However, this does not take into account the flow dynamics and basically time‐independent. In order to establish more robust framework that can link eruption rates surface signals lavas measured remotely, we investigate spreading hot, isoviscous, axisymmetric subaerial gravity current injected at constant rate from point source onto horizontal substrate. We performed laboratory...
In the present work, we use a numerical modelling approach based on 2.5-dimensional dislocation dynamics simulations to investigate transition between power and exponential laws in olivine for temperatures ranging 800 K 1700 stresses 100 500 MPa. We model deformation of an crystal by interplay glide climb dislocations. Plastic strain is produced glide, amount gliding dislocations being controlled acting as recovery mechanism. Within this framework, without need introducing any other...
Abstract Whether tectonic convergence at subduction zones is accommodated predominantly through seismic or aseismic deformation, the former potentially generating large earthquakes, varies considerably between margins. This margin‐scale variability has previously been linked to overriding plate trench migration, and their influence on interface stress state. While these processes are mantle‐scale dynamics, it unclear how such dynamics stress. We systematically analyze state in a suite of 2‐D...
On Earth, the velocity at which subducting plates are consumed their trenches (termed "subduction rate" herein) is typically 3 times higher than trench migration velocities. The subduction rate also 5 estimated lower mantle slab sinking rates. Using simple kinematic analyses, we show that if this present-day "kinematic state" operated into past, lithosphere should have accumulated and folded beneath near-stationary trenches. These predictions consistent with seismic tomography, images...
Abstract RED SEED stands for Risk Evaluation, Detection and Simulation during Effusive Eruption Disasters, combines stakeholders from the remote sensing, modelling response communities with experience in tracking volcanic effusive events. The group first met a three day-long workshop held Clermont Ferrand (France) between 28 30 May 2013. During each day, presentations were given reviewing state of art terms (a) volcano hot spot detection parameterization, (b) operational satellite-based...
Abstract. Subducting slabs are an important driver of plate motions, yet the relative importance different forces in governing subduction motions and styles remains incompletely understood. Basal drag has been proposed to be a minor contributor forcing because lack correlation between size velocity observed reconstructed motions. Furthermore, single system models, low basal leads behaviour most consistent with observation that trench migration velocities generally compared convergence...
Abstract Lava ingress into a vulnerable population will be difficult to control, so that evacuation necessary for communities in the path of active lava, followed by post-event population, infrastructural, societal and community replacement and/or relocation. There is pressing need set up response chain bridges scientists responders during an effusive crisis allow near-real-time delivery globally standard ‘products’ timely adequate humanitarian response. In this chain, scientific research...
Abstract Effusion rate is a crucial parameter for the prediction of lava-flow advance and should be assessed in near real-time order to better manage volcanic crisis. Thermal remote sensing offers most promising avenue attain this goal. We present here ‘dynamic’ thermal proxy based on laboratory experiments physical framework viscous gravity currents, which can used estimate effusion from during an eruption. This reproduces first-order relationship between measured field associated powers...
Abstract The Eocene tectonic evolution of the easternmost Caribbean Plate (CP) boundary, that is Lesser Antilles subduction zone (LASZ), debated. Recents works shed light on a peculiar period duality in arc/back‐arc regions. A compressional‐to‐transpressional regime occurred north, while rifting and seafloor spreading Grenada basin to south. mechanism for this strong spatial variation its through time has yet be established. Here, using 3‐D mechanical models, we evaluate whether change...
Abstract. We propose a new exploration of the concept spontaneous subduction, i.e., lithospheric gravitational collapse without any external forcing, at transform fault (TF). first seek candidates in recent subduction initiations TF that could fulfill criteria and retain 3 natural cases: Izu-Bonin-Mariana (IBM), Yap, Matthew & Hunter. next perform an extensive conditions allowing sinking older plate oceanic using 2D thermo-mechanical simulations. Our parametric study aims better...
Initiation of new plate boundary can be related to a spatio-temporal evolution an intraplate vast diffuse deformation towards narrow highly deforming boundary. It also occur by reactivation inherited weak zone. In all cases, breaking requires weakening the lithospheric cold mantle, whose rheological parameterisation often features « yield strength » formulation that is not clearly actual mechanisms. On other hand, bulk effective viscosity for mantle rocks,...
The thermal structure of slabs is thought to be a key parameter for deep-focus earthquakes in subduction zones, since most proposed mechanisms, such as transformational faulting, dehydration reactions or shear instabilities, are controlled by temperature. However, the classical (shallow) "phi", associated downward advection isotherms and approximated slab age x sinking velocity (Kirby et al., 1996), does not explain seismicity occurring relativelty “hot” e.g. under...
At subduction zones, cold lithospheric plates dive deep into the hotter Earth’s mantle. Earthquakes can occur at depths of hundreds kilometers in these subducted slabs, apparently related to their thermal structures. Seismic tomography provides a first-order information on slab morphology but cannot discriminate « » from warm slabs partly due inhomogeneous repartition seismic sources and surface sensors. This study investigates potential gravity data GOCE mission...