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Bimodal pattern of seismicity detected at the ocean margin of an Antarctic ice shelf / Denis Lombardi in Geophysical journal international, vol 206 n° 2 (August 2016)  

Public [article]  inGeophysical journal international > vol 206 n° 2 (August 2016) . - pp 1375 - 1381 Titre : Bimodal pattern of seismicity detected at the ocean margin of an Antarctic ice shelf Type de document : Article/Communication Auteurs : Denis Lombardi, Auteur ; Lionel Benoit , Auteur ; Thierry Camelbeeck, Auteur ; Olivier Martin , Auteur ; Christophe Meynard , Auteur ; Christian Thom , Auteur Année de publication : 2016 Article en page(s) : pp 1375 - 1381 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] Antarctique [Termes IGN] calotte glaciaire [Termes IGN] coordonnées GPS [Termes IGN] déformation de la croute terrestre [Termes IGN] marée terrestre [Termes IGN] séisme Résumé : (auteur) In Antarctica, locally grounded ice, such as ice rises bordering floating ice shelves, plays a major role in the ice mass balance as it stabilizes the ice sheet flow from the hinterland. When in direct contact with the ocean, the ice rise buttressing effect may be altered in response of changing ocean forcing. To investigate this vulnerable zone, four sites near the boundary of an ice shelf with an ice rise promontory in Dronning Maud Land, East-Antarctica were monitored for a month in early 2014 with new instruments that include both seismic and GPS sensors. Our study indicated that this transition zone experiences periodic seismic activity resulting from surface crevassing during oceanic tide-induced flexure of the ice shelf. The most significant finding is the observation of apparent fortnightly tide-modulated low-frequency, long-duration seismic events at the seaward front of the ice rise promontory. A basal origin of these events is postulated with the ocean water surge at each new spring tide triggering basal crevassing or basal slip on a local bedrock asperity. Detection and monitoring of such seismicity may help identifying ice rise zones vulnerable to intensified ocean forcing. Numéro de notice : A2016--191 Affiliation des auteurs : LASTIG LOEMI+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1093/gji/ggw214 Date de publication en ligne : 05/06/2016 En ligne : https://doi.org/10.1093/gji/ggw214 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91841 [article]

Multi-method monitoring of Glacier d’Argentière dynamics / Lionel Benoit in Annals of Glaciology, vol 56 n° 70 (October 2015)    

Public [article]  inAnnals of Glaciology > vol 56 n° 70 (October 2015) . - pp 118 - 128 Titre : Multi-method monitoring of Glacier d’Argentière dynamics Type de document : Article/Communication Auteurs : Lionel Benoit , Auteur ; Amaury Deheck, Auteur ; Ha-Thai Pham, Auteur ; Flavien Vernier, Auteur ; Emmanuel Trouvé, Auteur ; Luc Moreau, Auteur ; Olivier Martin , Auteur ; Christian Thom , Auteur ; Marc Pierrot-Deseilligny , Auteur ; Pierre Briole, Auteur Année de publication : 2015 Projets : Géocubes / Article en page(s) : pp 118 - 128 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] Alpes (France) [Termes IGN] glacier [Termes IGN] surveillance hydrologique [Termes IGN] vitesse Résumé : (auteur) The flow of Glacier d'Argentière, French Alps, has been extensively studied by glaciologists for >100 years, but high-temporal- and high-spatial-resolution monitoring of its dynamics has rarely been carried out. In this paper, the terminal part of the main glacier was selected to undertake such a survey. The 2 month experiment (September–November 2013) included remote sensing to map the velocity field of the whole area, and a network of in situ measurements to record the ice velocity at the surface as well as at the base of the glacier with high precision and at high temporal resolution. These monitoring methods are combined to produce a comprehensive and reliable picture of the ice flow. Basal and surface in situ measurements are used to precisely monitor the temporal variability of the ice flow at a section of the glacier where crevassed areas and non-cracked ice coexist. The achieved results are an innovative and efficient tool to investigate the acceleration/deceleration pattern heterogeneities in ice flow that occur after heavy rainfall. Numéro de notice : A2015--065 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3189/2015AoG70A985 Date de publication en ligne : 26/07/2017 En ligne : http://dx.doi.org/10.3189/2015AoG70A985 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83257 [article]

Documents numériques

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Monitoring landslide displacements with the Geocube wireless network of low-cost GPS / Lionel Benoit in Engineering Geology, vol 195 (September 2015)  

Public [article]  inEngineering Geology > vol 195 (September 2015) . - pp 111 – 121 Titre : Monitoring landslide displacements with the Geocube wireless network of low-cost GPS Type de document : Article/Communication Auteurs : Lionel Benoit , Auteur ; Pierre Briole, Auteur ; Olivier Martin , Auteur ; Christian Thom , Auteur ; Jean-Philippe Malet, Auteur ; Patrice Ulrich, Auteur Année de publication : 2015 Projets : Géocubes / Article en page(s) : pp 111 – 121 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] effondrement de terrain [Termes IGN] Géocube [Termes IGN] onde sismique [Termes IGN] précipitation [Termes IGN] séisme Résumé : (auteur) The analysis of landslide hazard requires continuous and high frequency surface displacement monitoring at numerous and geomorphologically relevant locations. Ground-based geodetic methods (GNSS, tacheometry) allow very accurate and high frequency temporal observations while remote sensing methods (InSAR, terrestrial and satellite photogrammetry, LIDAR) allow spatially distributed observations at high spatial resolution. A single surface deformation monitoring technique coupling all these capabilities is still missing. The Geocube system has been designed to partly overcome this pitfall by creating a low-cost, flexible, easy to install and wireless GPS receiver. Dense Geocube monitoring networks can be set easily for operational observations. Furthermore, the monitoring of other landslide properties (micro-seismicity, seismic waves) or triggering factors (meteorology, slope hydrology) is possible with the capacity of integrating additional sensors to the Geocube. This work presents the Geocube system and the results of a field campaign performed during the summer 2012 at the Super-Sauze landslide, southern French Alps, with a network of wireless low-cost GPS. The objective was to assess the performance of the Geocube system in real field monitoring conditions. Our results document the spatial and temporal evolution of the landslide during a period of 40 days. Landslide acceleration periods are detected and correlated to rainfall events. Numéro de notice : A2015--064 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.enggeo.2015.05.020 Date de publication en ligne : 06/06/2015 En ligne : http://dx.doi.org/10.1016/j.enggeo.2015.05.020 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83253 [article]

Low-cost GPS sensors for deformation monitoring / Lionel Benoit in GIM international, vol 29 n° 4 (April 2015)

Public [article]  inGIM international > vol 29 n° 4 (April 2015) . - pp 25 - 27 Titre : Low-cost GPS sensors for deformation monitoring Type de document : Article/Communication Auteurs : Lionel Benoit , Auteur ; Olivier Martin , Auteur ; Christian Thom , Auteur Année de publication : 2015 Article en page(s) : pp 25 - 27 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] Géocube [Termes IGN] glacier [Termes IGN] positionnement par GPS [Termes IGN] récepteur GPS [Termes IGN] réseau de capteurs [Termes IGN] surveillance géologique Résumé : (auteur) Deformation monitoring of glaciers is of great value to scientists with an interest in climate change. Due to the slow movements of glaciers, a semi-permanent deformation system is the method to monitor the changes. Using low-cost GPS receivers that work in a wireless sensor network such as a set-up feasible. Numéro de notice : A2015-448 Affiliation des auteurs : IGN (2012-2019) Thématique : POSITIONNEMENT/SOCIETE NUMERIQUE Nature : Article nature-HAL : ArtSansCL DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77079 [article]

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Real-time deformation monitoring by a wireless network of low-cost GPS / Lionel Benoit in Journal of applied geodesy, vol 8 n° 2 (June 2014)  

Public [article]  inJournal of applied geodesy > vol 8 n° 2 (June 2014) . - pp 119 - 128 Titre : Real-time deformation monitoring by a wireless network of low-cost GPS Type de document : Article/Communication Auteurs : Lionel Benoit , Auteur ; Pierre Briole, Auteur ; Olivier Martin , Auteur ; Christian Thom , Auteur Année de publication : 2014 Article en page(s) : pp 119 - 128 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] déformation de la croute terrestre [Termes IGN] filtre de Kalman [Termes IGN] positionnement par GPS [Termes IGN] radiocommunication [Termes IGN] récepteur monofréquence [Termes IGN] réseau de capteurs [Termes IGN] temps réel Résumé : (auteur) Monitoring small size area deformations calls for increasingly precise data with greater space and time resolution. To this aim, a GPS data processing method designed for wireless networks of mono-frequency GPS receivers is proposed. The different steps of the method are explained: the GPS processing is first detailed with the design of parametric and stochastic models, their inversion by an extended Kalman filter and the mitigation of the main errors: multipath. A parsimonious radio data transfer protocol is then proposed. It allows a real-time positioning thanks to a wireless transfer of GPS carrier phases data from receivers to a processing computer. Finally the method is tested on a network of mono-frequency receivers developed by the French National Mapping Agency (IGN). Tests prove its ability for real-time positioning with a fifteen receivers network, and a precision under the centimeter level is reached. Numéro de notice : A2014-776 Affiliation des auteurs : LASTIG LOEMI+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1515/jag-2013-0023 Date de publication en ligne : 29/05/2014 En ligne : http://10.1515/jag-2013-0023 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78738 [article]

Les Geocubes : réseau de capteurs autonomes géolocalisés pour la surveillance de structures et de zones à risque / Lionel Benoit in XYZ, n° 138 (mars - mai 2014) 

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Positionnement GPS précis et en temps réel dans le contexte de réseaux de capteurs sans fil type Geocube / Lionel Benoit (2014)  

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Compensation des mesures gravimétriques du RBF, version 1 / Lionel Benoit (2011)

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