Descripteur
|
Termes IGN > 1- Descripteurs géographiques > monde (géographie politique) > Océanie (géographie politique) > Vanuatu
VanuatuVoir aussi |
Documents disponibles dans cette catégorie (7)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externesEtendre la recherche sur niveau(x) vers le bas
The stability of tide gauges in the south Pacific determined from multiepoch geodetic levelling, 1992 to 2010 / Manoj Nilesh Deo in Marine geodesy, vol 36 n° 3 (September - November 2013)
Titre : The stability of tide gauges in the south Pacific determined from multiepoch geodetic levelling, 1992 to 2010 Type de document : Article/Communication Auteurs : Manoj Nilesh Deo, Auteur ; Ramesh Govind, Auteur ; Ahmed El-Mowafy, Auteur Année de publication : 2013 Article en page(s) : pp 261 - 284 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] analyse diachronique
[Termes IGN] Cook (îles)
[Termes IGN] données marégraphiques
[Termes IGN] marée océanique
[Termes IGN] niveau moyen des mers
[Termes IGN] nivellement par GPS
[Termes IGN] Pacifique Sud
[Termes IGN] repère de nivellement
[Termes IGN] Salomon (îles)
[Termes IGN] test de performance
[Termes IGN] Vanuatu
[Vedettes matières IGN] AltimétrieRésumé : (Auteur) Tide gauge data is important for determining global or local sea level rise with respect to a global geocentric reference frame. Data from repeated precise levelling connections between the tide gauges and a series of coastal and inland benchmarks, including Continuous GPS (CGPS) benchmarks, are used to determine the stability of tide gauges at 12 locations in the South Pacific. The method for determining this stability is based on a constant velocity model which minimises the net movement amongst a set of datum benchmarks surveyed since the installation of the tide gauges. When assessed at a 95% confidence interval, and with the exception of the Solomon Islands, none of the tide gauges were found to be in motion relative to their CGPS benchmarks. The Solomon Islands estimate is considered to be unreliable since the CGPS benchmark was recently established and has been surveyed fewer than three times. In Tonga and Cook Islands, the tide gauges were found to be disturbed or affected by survey errors whereas the Vanuatu results were affected by earthquakes. Numéro de notice : A2013-711 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/01490419.2013.786003 Date de publication en ligne : 18/03/2016 En ligne : https://doi.org/10.1080/01490419.2013.786003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32847
in Marine geodesy > vol 36 n° 3 (September - November 2013) . - pp 261 - 284[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 230-2013031 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Absolute seafloor vertical positioning using combined pressure gauge and kinematic GPS data Type de document : Article/Communication Auteurs : Valérie Ballu, Auteur ; Marie-Noëlle Bouin Année de publication : 2010 Article en page(s) : pp 65 - 77 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] coordonnées GPS
[Termes IGN] données marégraphiques
[Termes IGN] fond marin
[Termes IGN] GPS en mode cinématique
[Termes IGN] Pacifique (océan)
[Termes IGN] positionnement absolu
[Termes IGN] profondeur
[Termes IGN] séisme
[Termes IGN] subduction
[Termes IGN] tectonique des plaques
[Termes IGN] VanuatuRésumé : (Auteur) Knowledge of the position and motion of points on the seafloor can be critically important in both fundamental research (for example, global geodesy and plate tectonics) and for more practical applications such as seismic risk evaluation, off-shore construction and pipeline monitoring. In the Vanuatu subduction zone, for example, measuring deformation underwater could provide valuable information for modeling deformation and understanding the seismic cycle. We report a shallow water experiment in Vanuatu to measure the relative and absolute depth of seafloor points. The experiment differs from previous efforts mainly in that it uses the height of the sea surface determined by kinematic GPS, allowing us to locate the points in a global reference frame. The ITRF2005 ellipsoidal height of a seafloor benchmark was determined with a 1-sigma uncertainty of 0.7–2.1 cm. The estimated ellipsoidal height differs only by a few tenths of a centimeter between measurements made in 2004 and another set made in 2006. These results are encouraging and open new perspectives for vertical underwater deformation monitoring in shallow water areas. Sea-surface GPS measurements can also help to reduce the uncertainty in depth difference determination for relative measurements. Copyright Springer Numéro de notice : A2010-034 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-009-0345-y Date de publication en ligne : 19/09/2009 En ligne : https://doi.org/10.1007/s00190-009-0345-y Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30230
in Journal of geodesy > vol 84 n° 1 (January 2010) . - pp 65 - 77[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 266-2010011 SL Revue Centre de documentation Revues en salle Disponible
Titre : A kinematic GPS methodology for sea surface mapping, Vanuatu Type de document : Article/Communication Auteurs : Marie-Noëlle Bouin Année de publication : 2009 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] GPS en mode cinématique
[Termes IGN] relief de la surface de la mer
[Termes IGN] station de référence
[Termes IGN] subduction
[Termes IGN] surface de la mer
[Termes IGN] VanuatuRésumé : (auteur) During the past few decades, satellite altimetry has brought tremendous new knowledge about the spatial and temporal variations of sea surface heights over the Earth’s oceans. However, the precision is limited over short wavelengths and in coastal areas, and other methods such as kinematic GPS may be needed to fill in this information. We present kinematic GPS work aimed at mapping the sea surface height, with special attention to the precision one can expect. Active marine subduction zones, like the Vanuatu archipelago, may present short wavelength, high amplitude undulations of the sea surface height that are difficult to map with satellite altimetry. This paper presents the methodology used around Santo Island, in Vanuatu, to obtain a well-resolved local sea surface map with a precision of 5–15 cm limited by the sea conditions and the distance from the coastal reference station. We present the results of three campaigns in 2004, 2006 and 2007. Careful observation of the ship behaviour along the surveys as well as simultaneous recording of the ship attitude variations is mandatory to obtain reliable results. We show that the ship GPS antenna height varies with the ship’s velocity and we suggest a method to correct this effect. The final precision is estimated using the crossover differences method. Numéro de notice : A2009-580 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-009-0338-x En ligne : https://doi.org/10.1007/s00190-009-0338-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=88649
in Journal of geodesy > vol 83 n° 12 (December 2009)[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 266-09111 SL Revue Centre de documentation Revues en salle Disponible
Titre : Improving resolution and accuracy of mean sea surface from kinematic GPS, Vanuatu subduction zone Type de document : Article/Communication Auteurs : Marie-Noëlle Bouin Année de publication : 2009 Article en page(s) : pp 1017 - 1030 Note générale : biblographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] géoïde local
[Termes IGN] GPS en mode cinématique
[Termes IGN] surface de la mer
[Termes IGN] VanuatuRésumé : (auteur) Satellite altimetry provides an ocean mean sea surface (MSS) map with global coverage and overall excellent precision. However, in some areas, like the Vanuatu archipelago, the coverage and resolution of this tool are not sufficient to correctly map the short scale undulations of the sea surface, due to numerous islands and to strong lithospheric and mantle heterogeneities. New applications such as seafloor geodesy may require local mean surface representation with improved resolution in specific areas. We used sea surface height collected with kinematic GPS during three different cruises in 2004, 2006 and 2007 to reconstruct a homogeneous sea surface map around Santo Island, Vanuatu. We assess the accuracy of this GPS-derived local sea surface to 6–19 cm and evaluate the quality of existing altimetry and gravity-derived MSSs on the Vanuatu archipelago. Observed short scale undulations are interpreted as due to local geodynamics. Numéro de notice : A2009-582 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-009-0320-7 En ligne : https://doi.org/10.1007/s00190-009-0320-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=88651
in Journal of geodesy > vol 83 n° 11 (November 2009) . - pp 1017 - 1030[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 266-09101 SL Revue Centre de documentation Revues en salle Disponible 
Titre : Horizontal and vertical interseismic velocity fields in the Vanuatu subduction zone from GPS measurements: Evidence for a central Vanuatu locked zone Type de document : Article/Communication Auteurs : Nicolas Bergeot, Auteur ; Marie-Noëlle Bouin Année de publication : 2009 Article en page(s) : 20 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] champ de vitesse
[Termes IGN] coordonnées GPS
[Termes IGN] subduction
[Termes IGN] tectonique des plaques
[Termes IGN] VanuatuRésumé : (auteur) We analyzed interseismic velocity fields along the Vanuatu arc subduction zone from more than 45 GPS station measurements spanning 15 years. Convergence with respect to the Australian plate (AP) is normal to the trench, with amplitudes that vary greatly from a maximum of 170 mm a−1 at Vanikoro to 27 mm a−1 facing the D'Entrecasteaux Ridge (DER). Motions expressed relative to the Pacific plate (PP) highlight arc segmentation. Both the northern and southern segments undergo back‐arc spreading in a roughly NE‐SW direction, rotating anticlockwise and clockwise, respectively, while the central block moves eastward at a faster rate with respect to the PP than to the AP. More convergence is therefore accommodated at the eastern bound of the arc than at the Vanuatu trench. A right lateral strike‐slip movement (26 ± 1 mm a−1) along a zone normal to the trench (direction N70°) is necessary to accommodate the rate variation between the central and southern parts of the arc. Horizontal and vertical rates indicate partitioning between Malekula–southernmost Santo and central‐northern Santo blocks. Simple elastic modeling of the interseismic stage deformation gives locked zone characteristics (25° dip and 50 km width) and a 54 mm a−1 long‐term convergence rate between the AP and the central part of the Vanuatu arc from GPS horizontal and vertical velocities estimated south of the DER. The modeling does not fit the observed velocities facing the DER, probably because it does not account for the inelastic deformation associated with buoyant ridge subduction and back‐arc thrusting. Numéro de notice : A2009-586 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2007JB005249 Date de publication en ligne : 23/06/2009 En ligne : https://doi.org/10.1029/2007JB005249 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90613
in Journal of geophysical research : Solid Earth > Vol 114 n° B6 (June 2009) . - 20 p.[article]Documents numériques
en open access
Horizontal and vertical interseismic velocity fields ... - pdf éditeurAdobe Acrobat PDFRattachement des balises Doris de localisation de Lifou et Tanna aux sites GPS du réseau GSLNH [Géodésie Spatiale Loyauté / Didier Maillard (1996)
Permalink
