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Plate kinematic of Nubia-Somalia using combined DORIS and GPS solution / Jean-Mathieu Nocquet in Journal of geodesy, vol 80 n° 8-11 (November 2006)  

Public [article]  inJournal of geodesy > vol 80 n° 8-11 (November 2006) . - pp 591 - 607 Titre : Plate kinematic of Nubia-Somalia using combined DORIS and GPS solution Type de document : Article/Communication Auteurs : Jean-Mathieu Nocquet , Auteur ; Pascal Willis , Auteur ; S. Garcia, Auteur Année de publication : 2006 Article en page(s) : pp 591 - 607 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] Afrique (géographie physique) [Termes IGN] bruit blanc [Termes IGN] bruit rose [Termes IGN] champ de vitesse [Termes IGN] géodynamique [Termes IGN] International Terrestrial Reference Frame [Termes IGN] Nubie [Termes IGN] positionnement cinématique [Termes IGN] positionnement par DORIS [Termes IGN] positionnement par GPS [Termes IGN] rift [Termes IGN] série temporelle [Termes IGN] Somalie [Termes IGN] tectonique des plaques Résumé : (Auteur) We have used up to 12 years of data to assess DORIS performance for geodynamics applications. We first examine the noise characteristics of the DORIS time-series of weekly station coordinates to derive realistic estimates of velocity uncertainties. We find that a combination of white and flicker noise best explains the DORIS time-series noise characteristics. Second, weekly solutions produced by the Institut Géographique National/Jet Propulsion Laboratory (IGN/JPL) DORIS Analysis Centre are combined to derive a global velocity field. This solution is combined with two independent GPS solutions, including 11 sites on Nubia and 5 on the Somalia plate. The combination indicates that DORIS horizontal velocities have an average accuracy of 3 mm/year, with best-determined sites having velocity accuracy better than 1 mm/year (one-sigma levels). Using our combined velocity field, we derive an updated plate kinematics model with a focus on the Nubia–Somalia area. Including DORIS data improves the precision of the angular velocity vector for Nubia by 15%. Our proposed model provides robust bounds on the maximum opening rates along the East African Rift (4.7–6.7 mm/year). It indicates opening rates 15 and 7% slower than values predicted by NUVEL-1A for the southern Atlantic Ocean and Indian Ocean, respectively. These differences are likely to arise from the fact that NUVEL-1A considered Africa as a single non-deforming plate, while here we use a more refined approach. Copyright Springer Numéro de notice : A2006-536 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-006-0078-0 En ligne : https://doi.org/10.1007/s00190-006-0078-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28259 [article]

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