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Vertical crustalmotion derived from satellite altimetry and tide gauges, and comparisons with DORIS measurements / R. Ray in Advances in space research, vol 45 n° 12 (15/06/2010)
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Titre : Vertical crustalmotion derived from satellite altimetry and tide gauges, and comparisons with DORIS measurements Type de document : Article/Communication Auteurs : R. Ray, Auteur ; Brian D. Beckley, Auteur ; Franck G. Lemoine, Auteur Année de publication : 2010 Article en page(s) : pp 1510 - 1522 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] altimétrie satellitaire par radar
[Termes IGN] analyse comparative
[Termes IGN] déformation verticale de la croute terrestre
[Termes IGN] données altimétriques
[Termes IGN] données DORIS
[Termes IGN] données marégraphiques
[Termes IGN] marée terrestre
[Termes IGN] série temporelleRésumé : (Auteur) A somewhat unorthodox method for determining vertical crustal motion at a tide-gauge location is to difference the sea level time series with an equivalent time series determined from satellite altimetry. To the extent that both instruments measure an identical ocean signal, the difference will be dominated by vertical land motion at the gauge. We revisit this technique by analyzing sea level signals at 28 tide gauges that are colocated with DORIS geodetic stations. Comparisons of altimeter-gauge vertical rates with DORIS rates yield a median difference of 1.8 mm yr-1 and a weighted root-mean-square difference of 2.7 mm yr-1. The latter suggests that our uncertainty estimates, which are primarily based on an assumed AR(1) noise process in all time series, underestimates the true errors. Several sources of additional error are discussed, including possible scale errors in the terrestrial reference frame to which altimeter-gauge rates are mostly insensitive. One of our stations, Malè, Maldives, which has been the subject of some uninformed arguments about sea-level rise, is found to have almost no vertical motion, and thus is vulnerable to rising sea levels. Numéro de notice : A2010-364 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2010.02.020 En ligne : https://doi.org/10.1016/j.asr.2010.02.020 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30558
in Advances in space research > vol 45 n° 12 (15/06/2010) . - pp 1510 - 1522[article]vol 5 n° 4 - June 2010 (Bulletin de Inside GNSS)
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Titre : vol 5 n° 4 - June 2010 Type de document : Périodique Année de publication : 2010 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale Numéro de notice : 159-201004 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Numéro de périodique Permalink : https://documentation.ensg.eu/index.php?lvl=bulletin_display&id=21929 [n° ou bulletin]ContientRéservation
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Code-barres Cote Support Localisation Section Disponibilité 159-2010041 SL Revue Centre de documentation Revues en salle Disponible Upper mantle rheology from GRACE and GPS postseismic deformation after the 2004 Sumatra‐Andaman earthquake / Isabelle Panet in Geochemistry, Geophysics, Geosystems, vol 11 n° 6 (June 2010)
[article]
Titre : Upper mantle rheology from GRACE and GPS postseismic deformation after the 2004 Sumatra‐Andaman earthquake Type de document : Article/Communication Auteurs : Isabelle Panet , Auteur ; Fred Pollitz, Auteur ; Valentin O. Mikhailov, Auteur ; Michel Diament , Auteur ; P. Banerjee, Auteur ; K. Grijalva, Auteur Année de publication : 2010 Article en page(s) : 20 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] déformation de la croute terrestre
[Termes IGN] données GPS
[Termes IGN] données GRACE
[Termes IGN] manteau terrestre
[Termes IGN] rhéologie
[Termes IGN] séisme
[Termes IGN] SumatraRésumé : (auteur) Mantle rheology is one of the essential, yet least understood, material properties of our planet, controlling the dynamic processes inside the Earth's mantle and the Earth's response to various forces. With the advent of GRACE satellite gravity, measurements of mass displacements associated with many processes are now available. In the case of mass displacements related to postseismic deformation, these data may provide new constraints on the mantle rheology. We consider the postseismic deformation due to the Mw = 9.2 Sumatra 26 December 2004 and Mw = 8.7 Nias 28 March 2005 earthquakes. Applying wavelet analyses to enhance those local signals in the GRACE time varying geoids up to September 2007, we detect a clear postseismic gravity signal. We supplement these gravity variations with GPS measurements of postseismic crustal displacements to constrain postseismic relaxation processes throughout the upper mantle. The observed GPS displacements and gravity variations are well explained by a model of viscoelastic relaxation plus a small amount of afterslip at the downdip extension of the coseismically ruptured fault planes. Our model uses a 60 km thick elastic layer above a viscoelastic asthenosphere with Burgers body rheology. The mantle below depth 220 km has a Maxwell rheology. Assuming a low transient viscosity in the 60–220 km depth range, the GRACE data are best explained by a constant steady state viscosity throughout the ductile portion of the upper mantle (e.g., 60–660 km). This suggests that the localization of relatively low viscosity in the asthenosphere is chiefly in the transient viscosity rather than the steady state viscosity. We find a 8.1018 Pa s mantle viscosity in the 220–660 km depth range. This may indicate a transient response of the upper mantle to the high amount of stress released by the earthquakes. To fit the remaining misfit to the GRACE data, larger at the smaller spatial scales, cumulative afterslip of about 75 cm at depth should be added over the period spanned by the GRACE models. It produces only small crustal displacements. Our results confirm that satellite gravity data are an essential complement to ground geodetic and geophysical networks in order to understand the seismic cycle and the Earth's inner structure. Numéro de notice : A2010-655 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2009GC002905 Date de publication en ligne : 19/06/2010 En ligne : https://doi.org/10.1029/2009GC002905 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91728
in Geochemistry, Geophysics, Geosystems > vol 11 n° 6 (June 2010) . - 20 p.[article]Documents numériques
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Upper mantle rheology from GRACE and GPS ... - pdf éditeurAdobe Acrobat PDF vol 5 n° 3 - May 2010 (Bulletin de Inside GNSS)
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Titre : vol 5 n° 3 - May 2010 Type de document : Périodique Année de publication : 2010 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale Numéro de notice : 159-201003 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Numéro de périodique Permalink : https://documentation.ensg.eu/index.php?lvl=bulletin_display&id=21928 [n° ou bulletin]ContientRéservation
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Code-barres Cote Support Localisation Section Disponibilité 159-2010031 SL Revue Centre de documentation Revues en salle Disponible GPSENSOR monitoring system in China / H. Zhang in GEO: Geoconnexion international, vol 9 n° 4 (april 2010)
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Titre : GPSENSOR monitoring system in China Type de document : Article/Communication Auteurs : H. Zhang, Auteur Année de publication : 2010 Article en page(s) : pp 44 - 46 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] antenne GNSS
[Termes IGN] Chine
[Termes IGN] surveillance d'ouvrage
[Termes IGN] surveillance géologiqueRésumé : (Editeur) China has seen rapid development in the economy in the last thirty years, and a lot of building and land construction took place along with economic growth. With some disasters accredited to building and land deformation in some places, deformation monitoring research, technologies and applications are now valued much higher in importance. Haijiao (Rebecca) Zhang describes how the GPSensor Monitoring System is helping. Copyright Geo:Geoconnexion Numéro de notice : A2010-086 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30282
in GEO: Geoconnexion international > vol 9 n° 4 (april 2010) . - pp 44 - 46[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 062-2010041 SL Revue Centre de documentation Revues en salle Disponible Impact of regional reference frame definition on geodynamic interpretations / Juliette Legrand in Journal of geodynamics, vol 49 n° 3-4 (April 2010)Permalinkvol 5 n° 2 - March - April 2010 (Bulletin de Inside GNSS)Permalink1 antenna, 3 dimensions: GPS flight control in UAV operations / C. Kee in Inside GNSS, vol 5 n° 2 (March - April 2010)PermalinkTechnologie & plus = Technology & more (Bulletin de Technology & more) / TrimblePermalinkThe angular velocities of the plates and the velocity of Earth's centre from space geodesy / Donald F. Argus in Geophysical journal international, vol 180 n° 3 (March 2010)PermalinkGlobal 4DVAR assimilation and forecast experiments using AMSU observations over land. Part II: Impacts of assimilating surface-sensitive channels on the African monsoon during AMMA / Fatima Karbou in Weather and Forecasting, vol 25 n° 1 (February 2010)Permalinkvol 5 n° 1 - January - February 2010 (Bulletin de Inside GNSS)PermalinkAbsolute seafloor vertical positioning using combined pressure gauge and kinematic GPS data / Valérie Ballu in Journal of geodesy, vol 84 n° 1 (January 2010)PermalinkAcoustics & GPS: real-time scoring and classification of munitions / M. Cardoza in Inside GNSS, vol 5 n° 1 (January - February 2010)PermalinkBiais et dérives dans l'altimétrie satellitale à partir de comparaisons avec des marégraphes co-localisés avec des stations GPS / Médéric Gravelle (2010)Permalink