A5037666762- earthquake and tectonic studies
- Seismic Imaging and Inversion Techniques
- Seismology and Earthquake Studies
- Seismic Waves and Analysis
- Hydraulic Fracturing and Reservoir Analysis
- Earthquake Detection and Analysis
- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Geological and Geophysical Studies Worldwide
- Drilling and Well Engineering
- Geophysical Methods and Applications
- Ultrasonics and Acoustic Wave Propagation
- Non-Destructive Testing Techniques
- Seismic Performance and Analysis
- Reservoir Engineering and Simulation Methods
- Marine and environmental studies
- Landslides and related hazards
- Underwater Acoustics Research
- Medical Imaging Techniques and Applications
- Sparse and Compressive Sensing Techniques
- Nuclear Physics and Applications
- Atmospheric and Environmental Gas Dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Structural Analysis of Composite Materials
- Groundwater flow and contamination studies
Universitas Gadjah Mada
2025
Électricité de France (France)
2019-2024
Université de franche-comté
2010-2015
Centre National de la Recherche Scientifique
2008-2015
Institut des Sciences de la Terre
2015
Université Gustave Eiffel
2015
CEA LIST
2015
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015
Université Grenoble Alpes
2015
Centre hospitalier de Tulle
2012
Abstract A comprehensive site study carried out in an Upper Devonian shale gas reservoir at a southern West Virginia provided data to test geomechanical model for stimulation of the Huron formation. Using which natural fractures provide primary conduits production and are major target stimulation, triggers shear slip on those pre-existing fractures, we were able predict shape volume stimulated by injection high-quality foam match flow rates pressures using dual porosity permeability...
Abstract Clay formations are present in reservoirs and earthquake faults, but questions remain on their mechanical behavior, as they can vary from ductile (aseismic) to brittle (seismic). An experiment, at a scale of 10 m, aims reactivate natural fault by fluid pressure shale materials. The injection area was surrounded dense monitoring network comprising pressure, deformation, seismicity sensors, well‐characterized geological setting. Thirty‐two microseismic events were recorded during...
Probabilistic seismic hazard assessment (PSHA) requires the definition of source models (SSM) that describe spatial variations activity over region interest. They can include and combine active faults, seismotectonic area polygons as well zoneless, continuous descriptions seismicity. In this contribution, we present different components model developed to update probabilistic for continental France was published by Drouet et al. (2020).Particular effort dedicated produce a new historical...
Long-period long-duration (LPLD) seismic events are low-amplitude tremor-like signals that have been observed in some microseismic monitoring data sets acquired during hydraulic fracturing operations. The LPLD interpreted to be associated with slow slip along preexisting fractures presumed either high clay content or misaligned respect the current-day principal stress directions. However, a recent study indicates regional earthquakes, when recorded on vertical downhole arrays, similar signal...
[1] We study changes in effective stress (normal minus pore pressure) that occurred the French Alps during 2003–2004 Ubaye earthquake swarm. Two complementary data sets are used. First, a set of 974 relocated events allows us to finely characterize shape seismogenic area and spatial migration seismicity crisis. Relocations performed by double-difference algorithm. compute differences travel times at stations both from absolute picking cross-correlation delays multiplets. The resulting...
A crustal-scale N130°E strike-slip fault in the Ubaye-Argentera area, southwestern French-Italian Alps, was locus of a seismic swarm 2003-2004. Its reactivation is examined by 2-D frictional analysis. The regional stress tensor vicinity determined inversion focal mechanisms 38 events with largest magnitudes 2003-2004 swarm. Inversion shows that axis maximum principal σ1 oriented nearly horizontal and at 63° from plane intermediate σ2 almost parallel to plane. analysis static coefficient...
Locating microseismic events accurately is essential to characterizing hydrofracked reservoirs. Several location approaches have been developed solve this problem. We a global grid search method based on the Bayesian probabilistic approach. In addition retrieving minimum of cost function, it enabled computation uncertainty that was quantify quality results. The tightly related amount and observed data used perform location. Using multiple arrivals increased quantity information collected in...
The deformation of northwestern Turkey is the result encounter westward extrusion Anatolian plate with north‐south extension Aegean domain. While North Fault localizes former type and has been site more large earthquakes (9 events magnitude ≥7) than any other continental fault over past 100 years, diffuse characterized by spatial clusters smaller near‐continuous activity. We study evolution seismicity along in neighboring before after two 1999. observe that un‐ruptured section respond very...
Recent studies have shown that the Ubaye seismic swarm occurred in French southwestern Alps 2003–2004 was triggered by fluid overpressures. This contribution provides additional constraints on temporal and spatial changes overpressure during this swarm. The orientations of double‐couple nodal planes an extended set 74 focal solutions, spanning whole episode, are compared with regional stress field. Based a Mohr‐Coulomb analysis, these comparisons provide estimates pressures along fault...
In June 2000, two remarkably similar M s 6.6 earthquakes stroke southern Iceland in the space of 3 d. Here this doublet is analyzed to test whether aftershock triggering linear, that is, if patterns these main shocks are also similar. Methodologically, key issue separate contributions overall seismicity patterns. For purpose, we model first d (17–21 June) sequence with an Omori‐Utsu law. We then extrapolate it beyond 21 order estimate variations linked second shock. correct for large...
The characterization and understanding of rock deformation processes due to fluid flow is a challenging problem with numerous applications. signature this can be found in Earth Science Physics, notably applications natural hazard understanding, mitigation or forecast (e.g. earthquakes, landslides hydrological control, volcanic eruptions), industrial such as hydraulic-fracturing, steam-assisted gravity drainage, CO₂ sequestration operations soil remediation. Here we investigate the link...
Abstract. The latest generation of national and regional probabilistic seismic hazard assessments (PSHAs) in Europe presents stakeholders with multiple representations the many regions. This raises question why by how much estimates between two or more models differ, not only where overlap geographically but also new update existing ones. As modern PSHA incorporates increasingly complex analysis epistemic uncertainty, resulting is represented as a single value spectrum rather probability...
Triggering and quiescence patterns of seismicity in western Turkey, following the occurrence 12 November 1999 M w 7.2 Düzce earthquake are investigated. The changes rate analyzed along North Anatolian Fault segments that had ruptured 3 months earlier during 17 August 7.4 Izmit earthquake. Detection triggering is done by comparing would be expected if not happened to actual observed rate. rates estimated extrapolating preexisting pattern, using two complementary models: a simple Omori‐Utsu's...
ABSTRACT This study investigates errors induced by the use of average double‐couple radiation coefficients for computation earthquake magnitude. Indeed, when an focal mechanism cannot be anticipated before calculating its magnitude, we show that error depends on several factors such as event location, monitoring network aperture, type seismic phase involved in calculation (P/S waves) and mechanism. Energy radiated at lower amplitude is less likely to observed, so, applying absolute bound...
The last decade has seen the emergence of new ultrasonic array techniques going beyond simple application suitable delays (phased techniques) for focusing purposes. Amongst these techniques, particular method combining so-called FMC (Full Matrix Capture) acquisition scheme with synthetic algorithm denoted by TFM (Total Focusing Method) become popular in NDE community. 2014 WFNDEC benchmark aims at providing experimental data evaluating ability models to predict images obtained algorithms (or...
Summary After almost two years of monitoring the Groningen reservoir in Zeerijp area, Netherlands, set microseismic locations now enables to confirm at local scale several properties seismic activity gas field. Events occur (i) mainly within reservoir, (ii) along fault segments identified base Zechstein formation and (iii) have magnitude distributed according a Gutenberg-Richter with b-value 0.82 ± 0.03. Our catalogue contains more than 500 events M > −2.5 completeness level 0.1. The period...
Abstract Localization of signals is a widely applied technique used in different areas science telecommunication, medicine, or seismology. In this work, we study microseismic emissions due to stick‐slip events during pneumatic fracture transparent setup at laboratory scale and apply localization method “Estimated Source Energy Homogeneity.” The seismic location results are compared with the image correlation for displacement maps corresponding event times. We have observed (using optics...
Acoustic signal localization is a complex problem with wide range of industrial and academic applications. Herein, we propose method based on energy attenuation inverted source amplitude comparison (termed estimated homogeneity, or ESEH). This inversion tested both synthetic (numerical) data using Lamb wave propagation model experimental 2D plate (recorded 4 accelerometers sensitive up to 26 kHz). We compare the performance this technique classic algorithms: arrival time localization,...
Seismicity quiescences are expected to occur in places where the stress has been decreased, particular following large main shocks. However, such can be delayed by hours years and preceded an initial phase of earthquake triggering. This explain previous analyses arguing that seismicity shadows rarely observed, since they only seen after this triggering is over. Such case rupture zone, which experiences strongest aftershock activity despite having coseismically unloaded up tens bars. The 1999...