A5043255128- Seismic Waves and Analysis
- Seismic Imaging and Inversion Techniques
- earthquake and tectonic studies
- Seismic Performance and Analysis
- Geophysical Methods and Applications
- Geological and Geophysical Studies Worldwide
- Structural Health Monitoring Techniques
- Geological and Geochemical Analysis
- Geotechnical Engineering and Underground Structures
- Geophysical and Geoelectrical Methods
- Seismology and Earthquake Studies
- Landslides and related hazards
- Drilling and Well Engineering
- Geophysics and Sensor Technology
- Fluid Dynamics and Vibration Analysis
- Rock Mechanics and Modeling
- Earthquake Detection and Analysis
- Masonry and Concrete Structural Analysis
- Geological Modeling and Analysis
- High-pressure geophysics and materials
- Ultrasonics and Acoustic Wave Propagation
- Dam Engineering and Safety
- Grouting, Rheology, and Soil Mechanics
- Geotechnical Engineering and Soil Mechanics
- Graphite, nuclear technology, radiation studies
CEA Paris-Saclay - Etablissement de Fontenay-aux-roses
2024-2025
Institut de Radioprotection et de Sûreté Nucléaire
2015-2024
North Carolina State University
2022
Université Gustave Eiffel
2022
National Institute for Radiological Protection
2015
Institut national de recherche en informatique et en automatique
2013
In-Q-Tel
2011
Géoazur
2005-2008
Université Côte d'Azur
2003-2007
Centre National de la Recherche Scientifique
2003-2007
PREdiction of NOn-LINear soil behavior (PRENOLIN) is an international benchmark aiming to test multiple numerical simulation codes that are capable predicting nonlinear seismic site response with various constitutive models.One the objectives this project assessment uncertainties associated 1D effects.A first verification phase (i.e., comparison between on simple idealistic cases) will be followed by a validation phase, comparing predictions such estimations actual strongmotion recordings...
This article presents the main results of validation phase PRENOLIN project.PRENOLIN is an international benchmark on 1D nonlinear (NL) site-response analysis.This project involved 19 teams with 23 different codes tested.It was divided into two phases; first verifying numerical solution these idealized soil profiles using simple signals and real seismic records.The second described in this referred to code for analysis instrumented sites.This performed sites (KSRH10 Sendai) Japanese...
We perform the full elastic waveform inversion in frequency domain a 2-D geometry. This method allows imaging of two physical seismic parameters, using vertical and horizontal field components. The forward problem is discretized finite difference, allowing to simulate wavefield propagation. Moreover, it solved domain, fast approach for multisource multireceiver acquisition. non-linear based on pre-conditioned gradient method, where Born Rytov formulations are used compute Fréchet...
Knowledge of the acceleration spectral shape is crucial to various applications in engineering seismology.Spectral amplitude decays rapidly at high frequencies.Anderson and Hough (1984) introduced empirical factor κ model this attenuation.This first time studied a vertical array consisting more than two stations.We use 180 earthquakes recorded downhole with five stations soils rock investigate effect soil conditions on κ.Given that computation processes vary across literature when following...
Site-effect assessments performed through earthquake-based approaches, such as the standard spectral ratio (SSR), require good quality records of numerous earthquakes. In contrast, use ambient noise appears to be an attractive solution for ease and rapid computation site responses with sufficient spatial resolution (microzonation), especially in low seismicity areas. Two main approaches are tested here: horizontal-to-vertical (HVSR) noise-based SSR (SSRn). The HVSR uses relative amplitude...
A method is proposed for accurately describing arbitrary-shaped free boundaries in finite-difference schemes elastodynamics, a time-domain velocity–stress framework. The basic idea as follows: fictitious values of the solution are built vacuum, and injected into numerical integration scheme near boundaries. most original feature this way which these calculated. They based on boundary conditions compatibility satisfied by successive spatial derivatives solution, up to given order that depends...
The Pokupsko earthquake in Oct. 1909 (Ms 5.7) and, more recently, the Petrinja Dec. 2020 (Mw 6.4), both occurring along same Petrinja-Pokupsko Fault system, induced soil liquefaction phenomena alluvial plain of Kupa river (Croatia). While surface evidence was limited event, triggered extensive and well-developed features riverbanks. These included sand blows, fissures, ground settlements, lateral spreading, highlighting increased susceptibility deposits to seismic shaking event. The...
On November 11, 2019 a very shallow magnitude Mw 4.9 earthquake shook Le Teil (Ardèche, France), some ten kilometres from two nuclear facilities. This earthquake, the strongest in metropolitan France last twenty years, occurred on fault which was not identified as an active BDFA (Jomard et al., 2017) given its selection criteria, highlighting importance of studying seismic hazard low-seismicity areas. region with many assets, most are located Rhône valley and therefore...
A new stable and accurate, finite-difference 2D elastic seismic wave propagation modeling algorithm is developed, with a Perfectly Matched Layer (PML) absorbing boundary condition to avoid reflections from the edges of numerical model. This used study interaction surface waves near-surface heterogeneities. The effects different empty cavity shapes depths altered zones evaluated direct diffracted seismograms corresponding Rayleigh dispersion images. Differential calculated for models both...
We present here a detailed analysis of seismic data set recorded by dense seismological network installed over 6 months in the southeast France. This experiment was set-up at boundary between Ligurian basin and southern subalpine thrust belt (the Nice arc), which is complex tectonic region that undergoes low to moderate seismicity. more than 500 microearthquakes, among 348 occurred exactly centre during very active sequence lasted mainly 2 months. performed an absolute location all events...
Research Article| September 25, 2017 Robustness of Kappa (κ) Measurement in Low‐to‐Moderate Seismicity Areas: Insight from a Site‐Specific Study Provence, France Vincent Perron; Perron aFrench Alternative Energies and Atomic Energy Commission (CEA), Cadarache, DPIE/SA2S, DEN, Bât. 352, F‐13108 Saint‐Paul‐lez‐Durance, France, vincent.perron.mail@gmail.comfAlso at University Grenoble Alpes, ISTerre, CNRS, IRD, IFSTTAR, F‐38000 Grenoble, France; IRSN, PRP‐DGE/SCAN/BERSSIN, BP 17, F‐92262...
Seismic signal windowing is the preliminary step for many analysis procedures in engineering seismology (standard spectral ratio, quality factor, general inversion techniques, etc.). Moreover a noise window often necessary data control through signal-to-noise verification. Selecting can be challenging when large heterogeneous datasets are considered, especially they include short pre-event signals. This study proposes fully automatic and configurable (i.e., with default parameters that also...
On November 11, 2019, a M w 4.9 earthquake hit the region close to Montelimar (lower Rhône Valley, France), on eastern margin of Massif Central external part Alps. Occuring in moderate seismicity area, this is remarkable for its very shallow focal depth (between 1 and 3 km), magnitude, large damages it produced several villages. InSAR interferograms indicated rupture about 4 km long reaching surface reactivation ancient NE–SW La Rouvière normal fault reverse faulting agreement with...
ABSTRACT During an earthquake, site effects can play important role in triggering landslides. To document the seismic response of steep hillslopes, we deployed broadband seismometers across a mountain ridge Taiwan, area with high earthquake-induced landslide hazard. The has simple, representative shape, and landslides have previously occurred there. Our seismometer array recorded continuously during more than 1 yr, both ambient-noise regional moderate earthquakes as sources. Processing...
Twelve available two-way time high-resolution seismic reflection profiles located in the central part of middle Rhône valley are interpreted. In addition, one was reprocessed to determine P-wave velocities main geological units and convert this profile into a depth cross section. The Lower Upper Cretaceous clearly identifiable on all profiles, along with Messinian Erosion Surface (MES) carved out during Salinity Crisis (MSC) by paleo-Rhône its western tributaries, Ardèche Cèze paleo-canyons....
published or not.The documents may come from teaching and research institutions in France abroad, public private centers.
ABSTRACT Soil nonlinear behavior is often triggered in soft sedimentary deposits subjected to strong ground shaking and has led catastrophic damage civil infrastructure many past earthquakes. Nonlinear soils associated with large shear strains, increased material damping ratio, reduced stiffness. However, most investigations of the high-frequency spectral decay parameter κ, which captures attenuation, have focused on low-intensity motions inducing only small strains. Because studies...
Abstract The Vuache fault is a prominent structure cutting the southernmost Swiss Molasse basin, from Subalpine massifs to Jura range. It controls superficial (0 3 km), moderate (moment magnitude ≤ 5) and recurrent (a few events per century) seismicity. In order address seismic hazard associated this fault, we compiled existing data, performed new field investigations reprocessed lines. newly acquired data validate hypothesis of an active structure. Its imprint in landscape its Quaternary...
Basin response depends on the soil properties (site geometry, impedance contrast), constitutive model and input motion. Numerical modelling is a useful tool to understand role influence of these different parameters governing site effects. In this study, we focus 2-D P–SV seismic wave propagation in simple asymmetric basin model. We assess material (elastic, viscoelastic, elastoplastic viscoelastoplastic) as well importance motion development non-linearity. also show that both...
Numerical modelling is a useful tool to understand the role of different parameters (site geometry, impedance contrast, material properties, constitutive model, input motion) governing site effects. We focus here on 2-D P–SV seismic wave propagation in simple-shaped asymmetric model. consider two ways describing sedimentary infilling properties: basin either composed distinct homogeneous geological layers or described through properties progressively changing as function depth (smooth...
Imaging tectonic faults with small vertical offsets in argillites (clay rock) using geophysical methods is challenging. In the context of deep radioactive waste disposals, presence such has to be assessed because they can modify rock-confining properties. Tournemire Experimental Platform (TEP, Aveyron, France), fault zones and complex shape have been identified from underground works. However, 3D high-resolution surface seismic limitations this that led us consider detection characterization...
SUMMARY The local ground motion amplification related to the geology at a specific site (i.e. so-called effects) may be classically quantified through SSR (standard spectral ratio) technique applied on earthquake recordings. However, such quantification might challenging carry out in low-to-moderate seismicity regions. Methods based background ambient noise, as noise-based standard ratio (SSRn), of great interest these areas. But noise-derived is particularly sensitive anthropogenic sources,...
We present a discontinuous Galerkin method for site effects assessment. The P–SV seismic wave propagation is studied in 2-D space heterogeneous media. first-order velocity–stress system obtained by assuming that the medium linear, isotropic and viscoelastic, thus considering intrinsic attenuation. associated stress–strain relation time domain being convolution, which numerically intractable, we consider rheology of generalized Maxwell body replacing convolution set differential equations....