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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Misiti, Michel; Misiti, Yves; Poggi, Jean-Michel; Portier, Bruno;

    Mixture of linear regression models is used for the short-term statistical forecasting of the daily mean PM10 concentration. Hourly concentrations of PM10 have been measured in three cities in Haute-Normandie (France): Rouen, Le Havre and Dieppe. The Haute-Normandie region is located at northwest of Paris, near the south side of Manche sea and is heavily industrialized. We consider six monitoring stations reflecting the diversity of situations: urban background, traffic, rural and industrial stations. We have focused our attention on recent data from 2007 to 2011. We forecast the daily mean PM10 concentration by modeling it as a mixture of linear regression models involving meteorological predictors and the average concentration measured on the previous day. The values of observed meteorological variables are used for fitting the models but the corresponding predictions are considered for the test data, leading to realistic evaluations of forecasting performances, which are calculated through a leave-one-out scheme on the four years. We discuss in this paper several methodological issues including estimation schemes, introduction of the deterministic predictions of meteorological models and how to handle the forecasting at various horizons from some hours to one day ahead.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Hyper Article en Lig...arrow_drop_down
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Amitrano, David;

    International audience; The deformation of rocks is associated with microcracks nucleation and propagation, i.e. damage. The accumulation of damage and its spatial localization lead to the creation of a macroscale discontinuity, so-called "fault" in geological terms, and to the failure of the material, i.e. a dramatic decrease of the mechanical properties as strength and modulus. The damage process can be studied both statically by direct observation of thin sections and dynamically by recording acoustic waves emitted by crack propagation (acoustic emission). Here we first review such observations concerning geological objects over scales ranging from the laboratory sample scale (dm) to seismically active faults (km), including cliffs and rock masses (Dm, hm). These observations reveal complex patterns in both space (fractal properties of damage structures as roughness and gouge), time (clustering, particular trends when the failure approaches) and energy domains (power-law distributions of energy release bursts). We use a numerical model based on progressive damage within an elastic interaction framework which allows us to simulate these observations. This study shows that the failure in rocks can be the result of damage accumulation.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ arXiv.org e-Print Ar...arrow_drop_down
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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    https://doi.org/10.1007/s10704...
    Article . 2006 . Peer-reviewed
    License: Springer TDM
    Data sources: Crossref
    https://doi.org/10.48550/arxiv...
    Article . 2007
    License: arXiv Non-Exclusive Distribution
    Data sources: Datacite
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Antonio Pio Rinaldi; Jonny Rutqvist; Frédéric Cappa;

    International audience; The importance of geomechanics--including the potential for faults to reactivate during large-scale geologic carbon sequestration operations--has recently become more widely recognized. However, notwithstanding the potential for triggering notable (felt) seismic events, the potential for buoyancy-driven CO2 to reach potable groundwater and the ground surface is actually more important from public safety and storage-efficiency perspectives. In this context, this work extends the previous studies on the geomechanical modeling of fault responses during underground carbon dioxide injection, focusing on the short-term integrity of the sealing caprock, and hence on the potential for leakage of either brine or CO2 to reach the shallow groundwater aquifers during active injection. We consider stress/strain-dependent permeability and study the leakage through the fault zone as its permeability changes during a reactivation, also causing seismicity. We analyze several scenarios related to the volume of CO2 injected (and hence as a function of the overpressure), involving both minor and major faults, and analyze the profile risks of leakage for different stress/strain-permeability coupling functions. We conclude that whereas it is very difficult to predict how much fault permeability could change upon reactivation, this process can have a significant impact on the leakage rate. Moreover, our analysis shows that induced seismicity associated with fault reactivation may not necessarily open up a new flow path for leakage. Results show a poor correlation between magnitude and amount of fluid leakage, meaning that a single event is generally not enough to substantially change the permeability along the entire fault length. Consequently, even if some changes in permeability occur, this does not mean that the CO2 will migrate up along the entire fault, breaking through the caprock to enter the overlying aquifer.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ International Journa...arrow_drop_down
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    International Journal of Greenhouse Gas Control
    Article . 2014 . Peer-reviewed
    Data sources: Crossref
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ International Journa...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      International Journal of Greenhouse Gas Control
      Article . 2014 . Peer-reviewed
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Pierrick Roperch; Jérôme Gattacceca; M. Valenzuela; Bertrand Devouard; +5 Authors

    International audience; We describe extended occurrences of unusual silicate glass surface layers from the Atacama Desert (Chile). These glasses, found near the town of Pica at four localities separated by up to 70 km, are neither fulgurites, nor volcanic glasses, nor metallurgical slags related to anthropic activity, but show close similarities to other glasses that have been previously attributed to large airbursts created by meteoroids entering the Earth's atmosphere. The glasses are restricted to specific Late Pleistocene terrains: paleo-wetlands and soils rich in organic matter with SiO2-rich plant remains, salts and carbonates. 14C dating and paleomagnetic data indicate that the glasses were formed during at least two distinct periods. This rules out the hypothesis of a single large airburst as the cause of surface melting. Instead, burning of organic-rich soils in dried-out grassy wetlands during climate oscillations between wet and dry periods can account for the formation of the Pica glasses. Large oases did indeed form in the hyperarid Atacama Desert due to elevated groundwater tables and increased surface discharge during the Central Andean Pluvial Event (roughly coeval with the Mystery interval and Younger Dryas). Finally, we discuss the implications of our results for the other surface glasses previously attributed to extraterrestrial events.

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    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Earth and Planetary Science Letters
    Article . 2017 . Peer-reviewed
    License: Elsevier TDM
    Data sources: Crossref
    Hal-Diderot
    Article . 2017
    Data sources: Hal-Diderot
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Xiaodong, Tan; Kennethp., Kodama; Gilder, Stuart,; Courtillot, Vincent; +1 Authors

    International audience; Fold axis strikes in the Yangtze fold belt of the South China Block (SCB) undergo significant changes over distances of >1000 km. This large-scale variation provides an ideal opportunity to test the oroclinal-bending hypothesis using palaeomagnetic methods, which we have attempted by drilling the Lower Triassic Daye Formation limestones in western Hubei Province. Thermal demagnetization isolated two components in most samples. A low unblocking temperature component (400 °C , unblocks univectorially towards the origin. The HTC passes the McFadden-fold test with an overall mean tilt-corrected direction of Dec = 255°, Inc =-24° (N= 7, α95= 9°) . Scanning electron microscopy (SEM) observations suggest an early diagenetic, possible (bio)chemical origin for the magnetic extracts dominated by Ti-poor magnetite. Rock magnetic data show no evidence that the HTC has been affected by tectonic or compaction strain. Our data together with previously published results suggest a general clockwise rotation pattern in the Middle Yangtze fold belt, which is probably related to the collision between the North and SCBs. Comparison of palaeomagnetic rotations with fold axis trends in the fold belt suggests that about 30° clockwise rotation occurred in the Middle reaches of the Yangtze River, while a 15° difference in fold axis trends would be due to initial variation within the fold belt. However, since little is known about the timing of the clockwise rotation, whether the Middle Yangtze fold belt is an orocline awaits further studies.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Geophysical Journal ...arrow_drop_down
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    Geophysical Journal International
    Article . 2007 . Peer-reviewed
    Data sources: Crossref
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    Authors: Abhra Giri; Sujata Tarafdar; Philippe Gouze; Tapati Dutta;

    It is well known that sedimentary rocks having same porosity can have very different pore size distribution. The pore distribution determines many characteristics of the rock among which, its transport property is often the most useful. Multifractal analysis is a powerful tool that is increasingly used to characterize the pore space. In this study we have done multifractal analysis of pore distribution on sedimentary rocks simulated using the Relaxed Bidisperse Ballistic Model (RBBDM). The RBBDM can generate a $3-D$ structure of sedimentary rocks of variable porosity by tuning the fraction $p$ of particles of two different sizes. We have also done multifractal analysis on two samples of real sedimentary rock to compare with the simulation studies. One sample, an oolitic limestone is of high porosity (40%)while the other is a reefal carbonate of low porosity around 7%. $2-D$ sections of X-ray micro-tomographs of the real rocks were stacked sequentially to reconstruct the real rock specimens. Both samples show a multifractal character, but we show that RBBDM gives a very realistic representation of a typical high porosity sedimentary rock. Comment: 9 figures

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    https://doi.org/10.48550/arxiv...
    Article . 2013
    License: arXiv Non-Exclusive Distribution
    Data sources: Datacite
    Geophysical Journal International
    Article . 2014 . Peer-reviewed
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Thomas Chauve; Maurine Montagnat; Cédric Lachaud; David Georges; +1 Authors

    Abstract. This paper presents, for the first time, the evolution of the local heterogeneous strain field around intra-granular cracking in polycrystalline ice, at the onset of tertiary creep. Owing to the high homologous temperature conditions and relatively low compressive stress applied, stress concentration at the crack tips is relaxed by plastic mechanisms associated with dynamic recrystallization. Strain field evolution followed by digital image correlation (DIC) directly shows the redistribution of strain during crack opening, but also the redistribution driven by crack tip plasticity mechanisms and recrystallization. Associated local changes in microstructure induce modifications of the local stress field evidenced by crack closure during deformation. At the ductile-to-brittle transition in ice, micro-cracking and dynamic recrystallization mechanisms can co-exist and interact, the later being efficient to relax stress concentration at the crack tips.

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    Solid Earth (SE)
    Article . 2017 . Peer-reviewed
    License: CC BY
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    Solid Earth (SE)
    Other literature type . 2018
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    Solid Earth; Solid Earth (SE)
    Article . 2017
    License: CC BY
    DOAJ
    Article . 2017
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Solid Earth (SE)arrow_drop_down
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      Solid Earth (SE)
      Article . 2017 . Peer-reviewed
      License: CC BY
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      Solid Earth (SE)
      Other literature type . 2018
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      Solid Earth; Solid Earth (SE)
      Article . 2017
      License: CC BY
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      Article . 2017
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    Authors: Rosalie Fuchs; Christel Pinazo; Pascal Douillet; Marion Fraysse; +3 Authors

    International audience; Since 2005, wind-driven 'sporadic' coastal upwelling events have been identified off the southwestern reef of New Caledonia. Several studies have described the main physical processes and induced surface patterns using 1D and 3D modelling, as well as in situ measurements. Previous models were applied at the mesoscale without taking into account the lagoon. Using a recently developed 3D coupled physical-biogeochemical model that considers the complex ocean-lagoon interface, we aim to understand better the impact of the upwelling on the lagoon. The model was found to be in good agreement with measured data reported in previous publications about two upwelling events. However, in general, levels of surface chlorophyll-a were overestimated by the model in the upwelling area when compared to ocean colour data and several hypotheses have been proposed to explain the discrepancy. We then tracked rich upwelled water using a forward Lagrangian transport analysis. Upwelled waters from the upper nutricline were found to be able to reach the South West lagoon. An anti-cyclonic eddy was detected near the upwelling area, potentially responsible, in part, for the rich water intrusions into the lagoon.

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    Horizon / Pleins textes
    Other literature type . 2013
    Estuarine Coastal and Shelf Science
    Article . 2013 . Peer-reviewed
    Data sources: Crossref
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    Authors: Antoine, Pierre; Auguste, Patrick; Bahain, Jean-Jacques; Louguet, Sophie;

    La paléofalaise, la formation continentale périglaciaire et le très riche gisement paléolithique moyen d’Ault-Onival (Somme) ont suscité l’intérêt des géologues et des préhistoriens depuis le début du xxe siècle. Cependant, ce site est très difficile d’accès en raison de sa localisation dans un niveau découvert seulement lors des plus basses mers, ce qui en complique l’étude. Si l’industrie lithique a fait l’objet de travaux détaillés à partir des riches assemblages provenant des prospections sur l’estran et de comparaisons avec les sites de référence de la Somme, la formation de versant périglaciaire (Formation d’Ault) n’avait jusqu’à récemment jamais été étudiée en détail. Des investigations ont donc été menées pendant plusieurs années à l’occasion des grandes marées et à la suite de périodes d’érosion de la surface des dépôts quaternaires par la mer. Des observations ont ainsi pu être effectuées sur la stratigraphie de la partie supérieure des sédiments et complétées par des sondages à la tarière et une prospection du niveau paléolithique en place. L’approche paléontologique a été basée sur l’analyse des collections conservées au Musée d’Abbeville et chez un chercheur amateur qui prospecte le site depuis de nombreuses années, mettant en exergue la présence du mammouth laineux. Les premiers résultats de cette étude permettent de confirmer un âge weichselien pour la mise en place de ces dépôts périglaciaires, ainsi que la formation du niveau durant une période pléniglaciaire. Une datation ESR/U-Th sur émail dentaire (dent de cheval) permet d’attribuer à ce niveau un âge de 55 ± 10 ka. La synthèse des données géologiques, paléontologiques et géochronologiques situe le niveau au Pléniglaciaire inférieur (SIM 4) ou à la charnière Pléniglaciaire inférieur-Pléniglaciaire moyen (SIM 4-3). Par ailleurs, la prise en compte de ­l’ensemble des données et du contexte structural suggère que la préservation de la Formation d’Ault est liée au rejeu récent (depuis le Pléistocène supérieur) d’une faille de direction N60-70, longeant la paléofalaise et à l’affaissement relatif du compartiment nord du substrat crayeux local. The fossil cliff, the chalky periglacial deposits and the very rich Palaeolithic site of Ault-Onival (Somme) have attracted the interest of geologists and specialists of Palaeolithic studies since the beginning of the twentieth century. This site is nevertheless very difficult to access owing to its location close to the low tide level, which therefore complicates its study. The Palaeolithic industry has already been the subject of detailed studies based on rich assemblages collected during systematic surveys of the foreshore and on comparisons with the reference sites of the Somme basin, although the periglacial deposits (Ault Formation) have never been studied in detail until now. New investigations have thus been carried out over several years during low tide episodes and also thanks to the erosion of the deposits by storms. Direct stratigraphical and sedimentological observations, complemented by hand auguring have thus been made on the upper part of the formation and completed by a survey of in situ Palaeolithic artefacts. The palaeontological study was based on the analysis of the assemblages (mainly Woolly Mammoth) preserved at the Museum of Abbeville and those collected by an amateur researcher who surveyed the site over many years. The initial results allowed confirmation of the attribution of the faunal assemblage to the Weichselian and the deposition of the sediments to a periglacial environment. ESR/U-series dating on a horse tooth provided an age of 55 ± 10 ka BP for this level. The synthesis of geological and palaeontological data, together with the geochronological results, correlate the deposits and the associated Palaeolithic site with the Weichselian Pleniglacial (MIS 4) or with the transition between MIS 4 and MIS 3 at about 58-60 ka. In addition, by taking into account previously-acquired data and the structural context, it is proposed that the preservation of the Ault Formation is linked to the movement during the Late Pleistocene of a N60-70 fault bordering the palaeo-cliff (subsidence of the northern part of the chalk bedrock).

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    Article . 2014
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    Article . 2011 . Peer-reviewed
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    Authors: Wieczorek, Mark A.; Le Feuvre, Mathieu;

    International audience; The Moon is currently locked in a spin-orbit resonance of synchronous rotation, of which one consequence is that more impacts should occur near the Moon's apex of motion (0° N, 90° W) than near its antapex of motion (0° N, 90° E). Several of the largest lunar impact basins could have temporarily unlocked the Moon from synchronous rotation, and after the re-establishment of this state the Moon would have been left in either its initial orientation, or one that was rotated 180° about its spin axis. We show that there is less than a 2% probability that the oldest lunar impact basins are randomly distributed across the lunar surface. Furthermore, these basins are preferentially located near the Moon's antapex of motion, and this configuration has less than a 0.3% probability of occurring by chance. We postulate that the current “near side” of the Moon was in fact its “far side” when the oldest basins formed. One basin with the required size and temporal characteristics to account for a 180° reorientation is the Smythii basin.

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    Icarus
    Article . 2009 . Peer-reviewed
    License: Elsevier TDM
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    Authors: Misiti, Michel; Misiti, Yves; Poggi, Jean-Michel; Portier, Bruno;

    Mixture of linear regression models is used for the short-term statistical forecasting of the daily mean PM10 concentration. Hourly concentrations of PM10 have been measured in three cities in Haute-Normandie (France): Rouen, Le Havre and Dieppe. The Haute-Normandie region is located at northwest of Paris, near the south side of Manche sea and is heavily industrialized. We consider six monitoring stations reflecting the diversity of situations: urban background, traffic, rural and industrial stations. We have focused our attention on recent data from 2007 to 2011. We forecast the daily mean PM10 concentration by modeling it as a mixture of linear regression models involving meteorological predictors and the average concentration measured on the previous day. The values of observed meteorological variables are used for fitting the models but the corresponding predictions are considered for the test data, leading to realistic evaluations of forecasting performances, which are calculated through a leave-one-out scheme on the four years. We discuss in this paper several methodological issues including estimation schemes, introduction of the deterministic predictions of meteorological models and how to handle the forecasting at various horizons from some hours to one day ahead.

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    Authors: Amitrano, David;

    International audience; The deformation of rocks is associated with microcracks nucleation and propagation, i.e. damage. The accumulation of damage and its spatial localization lead to the creation of a macroscale discontinuity, so-called "fault" in geological terms, and to the failure of the material, i.e. a dramatic decrease of the mechanical properties as strength and modulus. The damage process can be studied both statically by direct observation of thin sections and dynamically by recording acoustic waves emitted by crack propagation (acoustic emission). Here we first review such observations concerning geological objects over scales ranging from the laboratory sample scale (dm) to seismically active faults (km), including cliffs and rock masses (Dm, hm). These observations reveal complex patterns in both space (fractal properties of damage structures as roughness and gouge), time (clustering, particular trends when the failure approaches) and energy domains (power-law distributions of energy release bursts). We use a numerical model based on progressive damage within an elastic interaction framework which allows us to simulate these observations. This study shows that the failure in rocks can be the result of damage accumulation.

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    https://doi.org/10.1007/s10704...
    Article . 2006 . Peer-reviewed
    License: Springer TDM
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    https://doi.org/10.48550/arxiv...
    Article . 2007
    License: arXiv Non-Exclusive Distribution
    Data sources: Datacite
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    Authors: Antonio Pio Rinaldi; Jonny Rutqvist; Frédéric Cappa;

    International audience; The importance of geomechanics--including the potential for faults to reactivate during large-scale geologic carbon sequestration operations--has recently become more widely recognized. However, notwithstanding the potential for triggering notable (felt) seismic events, the potential for buoyancy-driven CO2 to reach potable groundwater and the ground surface is actually more important from public safety and storage-efficiency perspectives. In this context, this work extends the previous studies on the geomechanical modeling of fault responses during underground carbon dioxide injection, focusing on the short-term integrity of the sealing caprock, and hence on the potential for leakage of either brine or CO2 to reach the shallow groundwater aquifers during active injection. We consider stress/strain-dependent permeability and study the leakage through the fault zone as its permeability changes during a reactivation, also causing seismicity. We analyze several scenarios related to the volume of CO2 injected (and hence as a function of the overpressure), involving both minor and major faults, and analyze the profile risks of leakage for different stress/strain-permeability coupling functions. We conclude that whereas it is very difficult to predict how much fault permeability could change upon reactivation, this process can have a significant impact on the leakage rate. Moreover, our analysis shows that induced seismicity associated with fault reactivation may not necessarily open up a new flow path for leakage. Results show a poor correlation between magnitude and amount of fluid leakage, meaning that a single event is generally not enough to substantially change the permeability along the entire fault length. Consequently, even if some changes in permeability occur, this does not mean that the CO2 will migrate up along the entire fault, breaking through the caprock to enter the overlying aquifer.

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    International Journal of Greenhouse Gas Control
    Article . 2014 . Peer-reviewed
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      International Journal of Greenhouse Gas Control
      Article . 2014 . Peer-reviewed
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    Authors: Pierrick Roperch; Jérôme Gattacceca; M. Valenzuela; Bertrand Devouard; +5 Authors

    International audience; We describe extended occurrences of unusual silicate glass surface layers from the Atacama Desert (Chile). These glasses, found near the town of Pica at four localities separated by up to 70 km, are neither fulgurites, nor volcanic glasses, nor metallurgical slags related to anthropic activity, but show close similarities to other glasses that have been previously attributed to large airbursts created by meteoroids entering the Earth's atmosphere. The glasses are restricted to specific Late Pleistocene terrains: paleo-wetlands and soils rich in organic matter with SiO2-rich plant remains, salts and carbonates. 14C dating and paleomagnetic data indicate that the glasses were formed during at least two distinct periods. This rules out the hypothesis of a single large airburst as the cause of surface melting. Instead, burning of organic-rich soils in dried-out grassy wetlands during climate oscillations between wet and dry periods can account for the formation of the Pica glasses. Large oases did indeed form in the hyperarid Atacama Desert due to elevated groundwater tables and increased surface discharge during the Central Andean Pluvial Event (roughly coeval with the Mystery interval and Younger Dryas). Finally, we discuss the implications of our results for the other surface glasses previously attributed to extraterrestrial events.

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    Earth and Planetary Science Letters
    Article . 2017 . Peer-reviewed
    License: Elsevier TDM
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    Hal-Diderot
    Article . 2017
    Data sources: Hal-Diderot
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    Authors: Xiaodong, Tan; Kennethp., Kodama; Gilder, Stuart,; Courtillot, Vincent; +1 Authors

    International audience; Fold axis strikes in the Yangtze fold belt of the South China Block (SCB) undergo significant changes over distances of >1000 km. This large-scale variation provides an ideal opportunity to test the oroclinal-bending hypothesis using palaeomagnetic methods, which we have attempted by drilling the Lower Triassic Daye Formation limestones in western Hubei Province. Thermal demagnetization isolated two components in most samples. A low unblocking temperature component (400 °C , unblocks univectorially towards the origin. The HTC passes the McFadden-fold test with an overall mean tilt-corrected direction of Dec = 255°, Inc =-24° (N= 7, α95= 9°) . Scanning electron microscopy (SEM) observations suggest an early diagenetic, possible (bio)chemical origin for the magnetic extracts dominated by Ti-poor magnetite. Rock magnetic data show no evidence that the HTC has been affected by tectonic or compaction strain. Our data together with previously published results suggest a general clockwise rotation pattern in the Middle Yangtze fold belt, which is probably related to the collision between the North and SCBs. Comparison of palaeomagnetic rotations with fold axis trends in the fold belt suggests that about 30° clockwise rotation occurred in the Middle reaches of the Yangtze River, while a 15° difference in fold axis trends would be due to initial variation within the fold belt. However, since little is known about the timing of the clockwise rotation, whether the Middle Yangtze fold belt is an orocline awaits further studies.

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    Geophysical Journal International
    Article . 2007 . Peer-reviewed
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    Authors: Abhra Giri; Sujata Tarafdar; Philippe Gouze; Tapati Dutta;

    It is well known that sedimentary rocks having same porosity can have very different pore size distribution. The pore distribution determines many characteristics of the rock among which, its transport property is often the most useful. Multifractal analysis is a powerful tool that is increasingly used to characterize the pore space. In this study we have done multifractal analysis of pore distribution on sedimentary rocks simulated using the Relaxed Bidisperse Ballistic Model (RBBDM). The RBBDM can generate a $3-D$ structure of sedimentary rocks of variable porosity by tuning the fraction $p$ of particles of two different sizes. We have also done multifractal analysis on two samples of real sedimentary rock to compare with the simulation studies. One sample, an oolitic limestone is of high porosity (40%)while the other is a reefal carbonate of low porosity around 7%. $2-D$ sections of X-ray micro-tomographs of the real rocks were stacked sequentially to reconstruct the real rock specimens. Both samples show a multifractal character, but we show that RBBDM gives a very realistic representation of a typical high porosity sedimentary rock. Comment: 9 figures

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    https://doi.org/10.48550/arxiv...
    Article . 2013
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    Geophysical Journal International
    Article . 2014 . Peer-reviewed
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    Authors: Thomas Chauve; Maurine Montagnat; Cédric Lachaud; David Georges; +1 Authors

    Abstract. This paper presents, for the first time, the evolution of the local heterogeneous strain field around intra-granular cracking in polycrystalline ice, at the onset of tertiary creep. Owing to the high homologous temperature conditions and relatively low compressive stress applied, stress concentration at the crack tips is relaxed by plastic mechanisms associated with dynamic recrystallization. Strain field evolution followed by digital image correlation (DIC) directly shows the redistribution of strain during crack opening, but also the redistribution driven by crack tip plasticity mechanisms and recrystallization. Associated local changes in microstructure induce modifications of the local stress field evidenced by crack closure during deformation. At the ductile-to-brittle transition in ice, micro-cracking and dynamic recrystallization mechanisms can co-exist and interact, the later being efficient to relax stress concentration at the crack tips.

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    Article . 2017 . Peer-reviewed
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    Other literature type . 2018
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    Solid Earth; Solid Earth (SE)
    Article . 2017
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      Article . 2017 . Peer-reviewed
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      Article . 2017
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    Authors: Rosalie Fuchs; Christel Pinazo; Pascal Douillet; Marion Fraysse; +3 Authors

    International audience; Since 2005, wind-driven 'sporadic' coastal upwelling events have been identified off the southwestern reef of New Caledonia. Several studies have described the main physical processes and induced surface patterns using 1D and 3D modelling, as well as in situ measurements. Previous models were applied at the mesoscale without taking into account the lagoon. Using a recently developed 3D coupled physical-biogeochemical model that considers the complex ocean-lagoon interface, we aim to understand better the impact of the upwelling on the lagoon. The model was found to be in good agreement with measured data reported in previous publications about two upwelling events. However, in general, levels of surface chlorophyll-a were overestimated by the model in the upwelling area when compared to ocean colour data and several hypotheses have been proposed to explain the discrepancy. We then tracked rich upwelled water using a forward Lagrangian transport analysis. Upwelled waters from the upper nutricline were found to be able to reach the South West lagoon. An anti-cyclonic eddy was detected near the upwelling area, potentially responsible, in part, for the rich water intrusions into the lagoon.

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    Other literature type . 2013
    Estuarine Coastal and Shelf Science
    Article . 2013 . Peer-reviewed
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    Authors: Antoine, Pierre; Auguste, Patrick; Bahain, Jean-Jacques; Louguet, Sophie;

    La paléofalaise, la formation continentale périglaciaire et le très riche gisement paléolithique moyen d’Ault-Onival (Somme) ont suscité l’intérêt des géologues et des préhistoriens depuis le début du xxe siècle. Cependant, ce site est très difficile d’accès en raison de sa localisation dans un niveau découvert seulement lors des plus basses mers, ce qui en complique l’étude. Si l’industrie lithique a fait l’objet de travaux détaillés à partir des riches assemblages provenant des prospections sur l’estran et de comparaisons avec les sites de référence de la Somme, la formation de versant périglaciaire (Formation d’Ault) n’avait jusqu’à récemment jamais été étudiée en détail. Des investigations ont donc été menées pendant plusieurs années à l’occasion des grandes marées et à la suite de périodes d’érosion de la surface des dépôts quaternaires par la mer. Des observations ont ainsi pu être effectuées sur la stratigraphie de la partie supérieure des sédiments et complétées par des sondages à la tarière et une prospection du niveau paléolithique en place. L’approche paléontologique a été basée sur l’analyse des collections conservées au Musée d’Abbeville et chez un chercheur amateur qui prospecte le site depuis de nombreuses années, mettant en exergue la présence du mammouth laineux. Les premiers résultats de cette étude permettent de confirmer un âge weichselien pour la mise en place de ces dépôts périglaciaires, ainsi que la formation du niveau durant une période pléniglaciaire. Une datation ESR/U-Th sur émail dentaire (dent de cheval) permet d’attribuer à ce niveau un âge de 55 ± 10 ka. La synthèse des données géologiques, paléontologiques et géochronologiques situe le niveau au Pléniglaciaire inférieur (SIM 4) ou à la charnière Pléniglaciaire inférieur-Pléniglaciaire moyen (SIM 4-3). Par ailleurs, la prise en compte de ­l’ensemble des données et du contexte structural suggère que la préservation de la Formation d’Ault est liée au rejeu récent (depuis le Pléistocène supérieur) d’une faille de direction N60-70, longeant la paléofalaise et à l’affaissement relatif du compartiment nord du substrat crayeux local. The fossil cliff, the chalky periglacial deposits and the very rich Palaeolithic site of Ault-Onival (Somme) have attracted the interest of geologists and specialists of Palaeolithic studies since the beginning of the twentieth century. This site is nevertheless very difficult to access owing to its location close to the low tide level, which therefore complicates its study. The Palaeolithic industry has already been the subject of detailed studies based on rich assemblages collected during systematic surveys of the foreshore and on comparisons with the reference sites of the Somme basin, although the periglacial deposits (Ault Formation) have never been studied in detail until now. New investigations have thus been carried out over several years during low tide episodes and also thanks to the erosion of the deposits by storms. Direct stratigraphical and sedimentological observations, complemented by hand auguring have thus been made on the upper part of the formation and completed by a survey of in situ Palaeolithic artefacts. The palaeontological study was based on the analysis of the assemblages (mainly Woolly Mammoth) preserved at the Museum of Abbeville and those collected by an amateur researcher who surveyed the site over many years. The initial results allowed confirmation of the attribution of the faunal assemblage to the Weichselian and the deposition of the sediments to a periglacial environment. ESR/U-series dating on a horse tooth provided an age of 55 ± 10 ka BP for this level. The synthesis of geological and palaeontological data, together with the geochronological results, correlate the deposits and the associated Palaeolithic site with the Weichselian Pleniglacial (MIS 4) or with the transition between MIS 4 and MIS 3 at about 58-60 ka. In addition, by taking into account previously-acquired data and the structural context, it is proposed that the preservation of the Ault Formation is linked to the movement during the Late Pleistocene of a N60-70 fault bordering the palaeo-cliff (subsidence of the northern part of the chalk bedrock).

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    Article . 2014
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    Article . 2011 . Peer-reviewed
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    Authors: Wieczorek, Mark A.; Le Feuvre, Mathieu;

    International audience; The Moon is currently locked in a spin-orbit resonance of synchronous rotation, of which one consequence is that more impacts should occur near the Moon's apex of motion (0° N, 90° W) than near its antapex of motion (0° N, 90° E). Several of the largest lunar impact basins could have temporarily unlocked the Moon from synchronous rotation, and after the re-establishment of this state the Moon would have been left in either its initial orientation, or one that was rotated 180° about its spin axis. We show that there is less than a 2% probability that the oldest lunar impact basins are randomly distributed across the lunar surface. Furthermore, these basins are preferentially located near the Moon's antapex of motion, and this configuration has less than a 0.3% probability of occurring by chance. We postulate that the current “near side” of the Moon was in fact its “far side” when the oldest basins formed. One basin with the required size and temporal characteristics to account for a 180° reorientation is the Smythii basin.

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    Article . 2009 . Peer-reviewed
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