A5031709707- Radioactive element chemistry and processing
- Radioactive contamination and transfer
- Radioactivity and Radon Measurements
- Groundwater flow and contamination studies
- earthquake and tectonic studies
- Geological and Geochemical Analysis
- Groundwater and Isotope Geochemistry
- Hydraulic Fracturing and Reservoir Analysis
- Geophysical Methods and Applications
- Geotechnical and Geomechanical Engineering
- Atmospheric and Environmental Gas Dynamics
- Rock Mechanics and Modeling
- Landslides and related hazards
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- High-pressure geophysics and materials
- Glass properties and applications
- Seismic Imaging and Inversion Techniques
- Oil and Gas Production Techniques
- Geochemistry and Geologic Mapping
- Radiation Detection and Scintillator Technologies
- Hydrocarbon exploration and reservoir analysis
- Soil and Unsaturated Flow
- Geological formations and processes
- Seismology and Earthquake Studies
CEA DAM Île-de-France
2014-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2014-2024
Institut de physique du globe de Paris
2006-2022
Centre National de la Recherche Scientifique
1997-2022
Université Paris Cité
2006-2022
CEA Le Ripault
2022
École Normale Supérieure - PSL
2020
Université Paris Sciences et Lettres
2020
Sorbonne Paris Cité
2010-2015
École Normale Supérieure de Lyon
1997-1999
Abstract Radon‐222, a radioactive gas naturally produced in the Earth's crust, informs us about migration of fluids and is sometimes considered as potential earthquake precursor. Here we investigate effects mechanical thermal damage on radon emanation from various granites representative upper crust. Radon concentration measurements performed under triaxial stress pore fluid pressure show that resulting cycles differential intensifies release up to 170 ± 22% when sample ruptures. This peak...
Recent studies of active Californian faults allow us to investigate the mechanisms fluid flow and crack sealing along model pressure evolution during earthquake cycles. The is first based on observation that fluids from depth (stables isotopes traces elements analyses). also study deformation rocks near within at depth. Sampling was performed in have been recently uplifted. Studies thin sections produce evidence compaction fractured zones as transient processes after each earthquake. We...
Abstract Electric conductivity of air is an important characteristic the electric properties atmosphere. Testing instruments to measure ranging from ~10 −13 10 −9 S m −1 in natural conditions found Earth atmosphere not easy task. One possibility use stratospheric balloon flights; another (and a simpler one) look for terrestrial environments with significant radioactive decay. In this paper we present measurements carried out different types sensors two 222 Rn‐rich environments, i.e.,...
Abstract The study of iodine in glasses and melts is critical many areas, from geosciences to materials science waste management. Glasses the ternary system Na 2 O-B O 3 -SiO were studied with goal identifying a glass matrix able dissolve large quantities this element, identify main parameters affecting solubility iodine. Two sets experiments carried out: first one aim determining limit iodine, second structural variations occurring within network upon incorporation, influencing most both...
Research Article| January 01, 1997 Fluid flow vs. scale of shear zones in the lower continental crust and granulite paradox Eric Pili; Pili 1Laboratoire de Sciences la Terre, CNRS UMR 5570, École Normale Supérieure Lyon, F-69007 France Search for other works by this author on: GSW Google Scholar Simon M. F. Sheppard; Sheppard Jean-Marc Lardeaux; Lardeaux 2Laboratoire Pétrologie et Tectonique, Université Lyon I, F-69100, Jean-Emmanuel Martelat; Martelat 3Département Géologie, URA 10,...
Searching for small periodic signals, such as the 12 hr (S2) barometric tide, and monitoring their amplitude a function of time, can provide important clues on complex processes affecting fluid transport in unsaturated fractured media under multiple influences. Here, first, we show that modified spectrogram analysis (MSA) is more efficient than simple Fourier transform to reveal weak signals. Secondly, how transient signals be monitored time using spectrograms. These methods are applied...
Core Ideas Soil water stable isotope profiles can be used to quantify groundwater recharge. Climate conditions are recorded in of the unsaturated zone. provide insight into seasonality recharge events. A reliable estimate is needed for sustainable management resources. Water (δ 18 O and δ 2 H) zone frequently based on isotopic compositions precipitation. very simple approach consists integrating soil content between peak values composition, typically corresponding precipitation signatures...
Abstract Barometric pumping plays a crucial role in the release of trace gases from fractured porous media to atmosphere, and it requires rigorous complete modeling order go beyond approximate schemes available literature. Therefore, coupled set convection convection‐diffusion equations for slightly compressible fluid unsteady conditions should be solved. The numerical methodology is presented, applied close ones Roselend Natural Laboratory (France). precision code assessed mechanism...
A three-stage ion exchange chromatography method to purify molybdenum from uranium-rich samples was developed. Mo isotopic compositions were analyzed with a Neptune Plus MC-ICP-MS at ∼1200 volt ppm<sup>−1</sup>.