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IGS International GNSS Service technical report 2017. IGS Reference frame working group technical report 2017 / Paul Rebischung (2018)
Titre de série : IGS International GNSS Service technical report 2017 Titre : IGS Reference frame working group technical report 2017 Type de document : Chapitre/Contribution Auteurs : Paul Rebischung , Auteur ; Bruno Garayt , Auteur ; Zuheir Altamimi , Auteur Editeur : Bern : Astronomical Institute Année de publication : 2018 Importance : pp 188 - 192 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] International Terrestrial Reference FrameNuméro de notice : H2018-003 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Chapître / contribution nature-HAL : ChRapp DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90519 Documents numériques
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IGS Reference frame working group technical report 2017Adobe Acrobat PDF ITRF and seasonal station motions / Zuheir Altamimi (2018)
Titre : ITRF and seasonal station motions Type de document : Article/Communication Auteurs : Zuheir Altamimi , Auteur ; Xavier Collilieux , Auteur ; Kristel Chanard , Auteur ; Paul Rebischung , Auteur ; Laurent Métivier , Auteur Editeur : Munich [Allemagne] : European Geosciences Union EGU Année de publication : 2018 Collection : Geophysical Research Abstracts, ISSN 1607-7962 num. 20 Conférence : EGU 2018, General Assembly 08/04/2018 13/04/2018 Vienne Autriche OA Abstracts only Note générale : EGU2018-5103 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] variation saisonnièreRésumé : (auteur) By definition, the International Terrestrial reference Frame (ITRF) is a secular frame providing station positions at a reference epoch and linear velocities. Considering the requirements of some scientific applications, such as precise orbit determination, it becomes however important to develop corrective models that can be added to the ITRF coordinates to account for non-linear station motions, with respect to the Earth Center of Mass (CM). It is in this perspective that post-seismic deformation models were, for instance, provided with the ITRF2014 solution. The next most important non-linear effect to be taken into account would be seasonal station motions. Seasonal station motions were estimated during the ITRF2014 construction, independently for each space geodetic technique. No attempt was made, however, to combine the seasonal signals estimated for the different techniques, and seasonal corrections were therefore not provided with the ITRF2014 solution. We explore here the feasibility of deriving meaningful combined seasonal corrections in the CM frame using two possible approaches: (1) combining the seasonal signals estimated for the different techniques during the ITRF2014 construction, (2) accumulating the time series of input solutions from the four techniques all together, with properly weighted equality constraints on seasonal signals at co-location sites. Results of the two approaches will be confronted and analyzed in order to evaluate the level of consistency of the technique seasonal signals at co-location sites. Conclusion will be drawn on the possible ways of providing seasonal corrections consistent with the next ITRF release. Numéro de notice : C2018-063 Affiliation des auteurs : LASTIG LAREG (2012-mi2018) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComSansActesPubliés-Unpublished DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91397 ITRF: Three decades of research and development, current status and future plans / Zuheir Altamimi (2018)
Titre : ITRF: Three decades of research and development, current status and future plans Type de document : Article/Communication Auteurs : Zuheir Altamimi , Auteur ; Xavier Collilieux , Auteur ; Paul Rebischung , Auteur ; Laurent Métivier , Auteur ; Kristel Chanard , Auteur Editeur : Paris : Committee on Space Research COSPAR Année de publication : 2018 Conférence : COSPAR 2018, 42nd Scientific Assembly of the world Committee on Space Research 14/07/2018 22/07/2018 Pasadena Californie - Etats-Unis OA program & abstracts only Langues : Français (fre) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] International Terrestrial Reference FrameRésumé : (auteur) On the occasion of the thirtieth anniversary of the International Earth Rotation and Reference Systems Service (IERS), this paper reviews the progress that has been made in the development of the International Terrestrial Reference Frame (ITRF). A particular focus will be devoted to (1) the frame definition (origin, scale, orientation and their time evolution) and how it is maintained over time, (2) technique systematic errors and their impact on the frame definition, (3) the possible ways of dealing with station non-linear motions, and (4) the level of agreement between techniques at co-location sites. Improvements planned for the future ITRF releases will be outlined taking into account user needs in both operational geodesy and Earth science applications. Numéro de notice : C2018-069 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComSansActesPubliés-Unpublished Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91435 ITRF2014 and Earth figure changes: evidence of global viscous relaxation in recent ice melting Earth’s response? / Laurent Métivier (2018)
Titre : ITRF2014 and Earth figure changes: evidence of global viscous relaxation in recent ice melting Earth’s response? Type de document : Article/Communication Auteurs : Laurent Métivier , Auteur ; Hélène Rouby , Auteur ; Paul Rebischung , Auteur ; Zuheir Altamimi , Auteur Editeur : Munich [Allemagne] : European Geosciences Union EGU Année de publication : 2018 Collection : Geophysical Research Abstracts, ISSN 1607-7962 num. 20 Conférence : EGU 2018, General Assembly 08/04/2018 13/04/2018 Vienne Autriche OA Abstracts only Note générale : EGU2018-7567 Langues : Anglais (eng) Résumé : (auteur) The latest solution of the International Terrestrial Reference Frame, entitled ITRF2014, presents particularly large vertical velocities across Greenland, South East Alaska and the Antarctic Peninsula, compared with the previous solution ITRF2008. We investigate here the geophysical origin of this evolution of the ITRF velocity field. From a selection of ITRF2014 GNSS vertical velocities we determine solid Earth figure changes and Earth’s geocenter motion at different dates. By exploring various geophysical models, we show that our estimations can be well explained by the deformation due to Glacial Isostatic Adjustment (GIA) and Recent Ice Melting (RIM). However, we also show that the obtained solid Earth oblateness is not consistent with J2-rate observations if we assume purely elastic RIM deformations.We explore here different rheological scenarios that may explain this discrepancy, including low viscosities in the asthenosphere and/or the D” layer, or possible phase transitions in the mantle transition zone. Numéro de notice : C2018-071 Affiliation des auteurs : LASTIG LAREG (2012-mi2018) Thématique : POSITIONNEMENT Nature : Poster nature-HAL : Poster-avec-CL DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91463 Mass redistributions of the 2011 Mw 9.0 Tohoku-oki earthquake from GRACE / Isabelle Panet (2018)
Titre : Mass redistributions of the 2011 Mw 9.0 Tohoku-oki earthquake from GRACE Type de document : Article/Communication Auteurs : Isabelle Panet , Auteur ; Sylvain Bonvalot, Auteur ; Clément Narteau, Auteur ; Dominique Remy, Auteur ; Jean-Michel Lemoine, Auteur Editeur : Munich [Allemagne] : European Geosciences Union EGU Année de publication : 2018 Collection : Geophysical Research Abstracts, ISSN 1607-7962 num. 20 Conférence : EGU 2018, General Assembly 08/04/2018 13/04/2018 Vienne Autriche OA Abstracts only Note générale : EGU2018-9770 Langues : Anglais (eng) Résumé : (auteur) Large-scale gravity variations associated with the deformations surrounding giant earthquakes are one way to probe the rheology of the Earth’s upper mantle. They can be described from the GRACE mission data at temporal scales of months to years, and spatial scales inbetween those of local and global plate dynamics. Here, we consider the case of the 2011 Mw 9.0 Tohoku-oki earthquake and perform a space-time analysis of the GRACE geoid time series in a wide domain surrounding the event. In addition to the near-epicentral signals, we evidence regional-scale gravity variations starting a few months before the rupture, and propagating far within the Pacific and Philippine Sea plate interiors after the event. The gravity signals suggests that the earthquake is part of a broadscale deformation migrating from depth to surface across the entire subduction system, involving precursory slab extension at midupper mantle depths. We discuss the implications of these results, which provide unique evidence for episodic mass transfers at timescales of months in-depth of the plates boundaries. Numéro de notice : C2018-055 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComSansActesPubliés-Unpublished DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91466 Optimization of atomic clock locations for the geopotential determination from gravimetric network / Guillaume Lion (2018)PermalinkPrecipitable water vapour content from ESR/SKYNET sun–sky radiometers : validation against GNSS/GPS and AERONET over three different sites in Europe / Monica Campanelli in Atmospheric measurement techniques, vol 11 n° 1 (January 2018)PermalinkRecent activities of the GGOS standing committee on Performance simulations and Architectural Trade-Offs (PLATO) / Benjamin Männel (2018)PermalinkSpatial correlations in IGS station position time series / Clément Benoist (2018)PermalinkThe UN-GGIM initiative on the Global Geodetic Reference Frame and the fundamental contribution of VLBI: strengths and weaknesses / Zuheir Altamimi (2018)PermalinkTowards a realistic spatio-temporal description of GNSS station position time series / Paul Rebischung (2018)PermalinkEnhanced MODIS atmospheric total water vapour content trends in response to Arctic amplification / Dunya Alraddawi in Atmosphere, vol 8 n° 12 (December 2017)PermalinkSeasonal low-degree changes in terrestrial water mass load from global GNSS measurements / Thierry Meyrath in Journal of geodesy, vol 91 n° 11 (November 2017)PermalinkHydrologically-driven crustal stresses and seismicity in the New Madrid seismic zone / Timothy J. Craig in Nature communications, vol 8 (2017)PermalinkActivités néotectoniques et mouvements de terrain dans le Prérif (Secteur de l'autoroute Fès-Taza, Nord Maroc) / Hassan Tabbyaoui in Géologues, n° 194 (septembre 2017)Permalink