A5062986605- earthquake and tectonic studies
- Seismology and Earthquake Studies
- Seismic Waves and Analysis
- Earthquake Detection and Analysis
- Geological and Geochemical Analysis
- Seismic Imaging and Inversion Techniques
- High-pressure geophysics and materials
- Geological and Geophysical Studies Worldwide
- Leptospirosis research and findings
- Pneumonia and Respiratory Infections
- Antifungal resistance and susceptibility
- Antibiotic Use and Resistance
- Geophysics and Gravity Measurements
CEA DAM Île-de-France
2017-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2017-2024
CEA Grenoble
2020-2021
CEA Cadarache
2020-2021
Hero España (Spain)
2004
The point source parameters of the 11 November 2019 Le Teil earthquake (Mw 4.9) in France are revisited. Previous hypocenter determinations either located it on wrong side causative fault, or had to restrain depth ranges obtain epicenters compatible with fault geometry. Here, relocation is carried out three different approaches: (1) using as a master event an aftershock well-recorded by post-earthquake temporary seismic network; (2) optimizing velocity model two subareas; and (3) quarry...
We present a compilation of over 1700 focal mechanisms for nearly 1300 earthquakes in metropolitan France and bordering regions Western Europe. It is based on both published unpublished sources (articles, reports, observatory websites) which the mechanism solutions have been verified internal consistency, corrected cases minor errors rejected major inconsistencies between parameters. The database, labeled FMHex20, first version should be regularly updated future as part an ongoing effort...
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...
SUMMARY On 18 March 2021 an earthquake of magnitude Mw = 6.0 occurred offshore the Algerian coasts and generated a tsunami with amplitudes smaller than few millimetres crossing western Mediterranean Sea. The objective this study is threefold: first, to determine whether seismic sources calculated in context early warning are relevant; secondly, simulations able reproduce tide-gauge observations thirdly, define sensitivity grid resolutions parameters. In Sea, very small number available...
SUMMARY Metropolitan France is a region of slow tectonic deformation with sparse seismicity. On 11 November 2019, the ML 5.4 Le Teil earthquake became largest seismic event recorded in last 16 yr. This was by national networks and also wide variety other geophysical techniques including infrasound InSAR measurements. These complementary technologies offer opportunity to investigate detail source characteristics associated ground motion attenuation. Both waveform inversions interferogram...
SUMMARY A method of moment tensor inversion with a grid search on the source location and time is presently considered by French Tsunami Service Provider (TSP or CENALT in French) for rapid earthquake tsunami warning western Mediterranean Sea North-East Atlantic Ocean. The approach follows GRiD MT (Grid-based Real-time Determination Moment Tensors) methodology already implemented other regions. Here, we show developments made towards its implementation moderate to large earthquakes...
Abstract Since the M w 7.9 Gorkha earthquake of April 25, 2015, seismicity central and western Nepalese Himalaya has been monitored by an increasing number permanent seismic stations. These instruments contribute to location thousands aftershocks that occur at margin segment Main Himalayan Thrust (MHT) ruptured in 2015. They also help constrain clusters originated periphery fault earthquake, which may indicate a migration along system. We report here crisis followed Lamjung moderate 4.7...
On November 11, 2019, a Mw 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 Rouviere normal fault reverse faulting agreement with...
Research Article| December 12, 2017 Multiobjective Optimization of Regional and Teleseismic Data to Constrain the Source 12 September 2016 Mw 5.4 Earthquake in South Korea Jean Letort; Letort aUniversité Grenoble Alpes, ISTerre, 1381 rue de la Piscine, F‐38000 Grenoble, France, jean.letort@ujf-grenoble.fr Search for other works by this author on: GSW Google Scholar Aurélie Guilhem Trilla; Trilla bCEA, DAM, DIF, Ile F‐91297 Arpajon Cedex, France Sean R. Ford; Ford cAtmospheric, Earth Energy...
On March 18, 2021, a magnitude Mw 6.0 earthquake occurred offshore the Algerian coasts near Bejaia, resulting in tsunami with amplitudes smaller than few millimeters that crossed western Mediterranean Sea. This study pursues three primary objectives: firstly, to assess ability of simulations replicate tide-gauge observations; secondly, ascertain relevance seismic sources calculated within context early warning systems, against generation and thirdly, evaluate sensitivity grid resolutions...
Abstract The rapid detection and source characterization of any type seismic events including earthquakes nuclear explosions is one the missions many seismological laboratories. Most often, techniques used are based on phase picking amplitude measurements for detecting locating events, estimating magnitudes. From these parameters, especially anthropogenic sources, event screening then done empirically, this may lead to misinterpretations nature. However, it known that waveform inversion...
Abstract The rapid detection and source characterization of any type seismic events including nuclear explosions is one the major objectives for national data centres (NDC) seismological laboratories. Most often, used techniques are based on phase picking amplitude measurements detecting locating events, estimating magnitudes. From these parameters, event screening then done empirically, this may lead to misinterpretations nature. However, it known that waveform inversion determination...
<p>Metropolitan France is a region of slow tectonic deformation rates with sparse historical and instrumental seismicity, where geodesy not able to reach the required resolution in order resolve loadings. The few faults recognized as potential active rely on rare neotectonic slip rates, often integrated over geological scales.</p><p>In this context, M<sub>L</sub> 5.4 Le Teil 2019 earthquake particular interest...
<p>In order to rapidly detect, locate and characterize seismic events at regional scale, we are currently improving the parametrization of a continuous grid-search moment tensor inversion tool, called GRiD MT (Grid-based Real-Time Determination Moment Tensor, Kawakatsu, 1998, Tsuruoka, 2009, Guilhem et al., 2011 2013, Menager 2021). Here, first design procedure for small moderate size earthquakes in south-eastern France, but target its expansion any potential regions interest....
<p>The aim of this study is to implement at the CEA a grid search moment tensor inversion scheme (GRiD MT) for rapid detection and characterization seismic events, monitor low moderate magnitude earthquakes in France. Given heterogeneity network crustal geology over country, we propose use combination source grids focusing on specific regions. The GRiD MT approach requires an extensive preliminary analysis define different parameters (velocity model, frequency band, stations)...