Journal of geophysical research : Solid Earth / American Geophysical Union . vol 119 n° 12Paru le : 01/12/2014 |
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Ajouter le résultat dans votre panierGlobal coseismic deformations, GNSS time series analysis, and earthquake scaling laws / Laurent Métivier in Journal of geophysical research : Solid Earth, vol 119 n° 12 (December 2014)
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Titre : Global coseismic deformations, GNSS time series analysis, and earthquake scaling laws Type de document : Article/Communication Auteurs : Laurent Métivier , Auteur ; Xavier Collilieux , Auteur ; Daphné Lercier , Auteur ; Zuheir Altamimi , Auteur ; François Beauducel, Auteur Année de publication : 2014 Article en page(s) : pp 9095 - 9109 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] cohérence des données
[Termes IGN] déformation de la croute terrestre
[Termes IGN] données GPS
[Termes IGN] modèle numérique
[Termes IGN] réseau géodésique permanent
[Termes IGN] séisme
[Termes IGN] série temporelle
[Termes IGN] sismicitéRésumé : (auteur) We investigate how two decades of coseismic deformations affect time series of GPS station coordinates (Global Navigation Satellite System) and what constraints geodetic observations give on earthquake scaling laws. We developed a simple but rapid model for coseismic deformations, assuming different earthquake scaling relations, that we systematically applied on earthquakes with magnitude larger than 4. We found that coseismic displacements accumulated during the last two decades can be larger than 10m locally and that the cumulative displacement is not only due to large earthquakes but also to the accumulation of many small motions induced by smaller earthquakes. Then, investigating a global network of GPS stations, we demonstrate that a systematic global modeling of coseismic deformations helps greatly to detect discontinuities in GPS coordinate time series, which are still today one of the major sources of error in terrestrial reference frame construction (e.g., the International Terrestrial Reference Frame). We show that numerous discontinuities induced by earthquakes are too small to be visually detected because of seasonal variations and GPS noise that disturb their identification. However, not taking these discontinuities into account has a large impact on the station velocity estimation, considering today’s precision requirements. Finally, six groups of earthquake scaling laws were tested. Comparisons with our GPS time series analysis on dedicated earthquakes give insights on the consistency of these scaling laws with geodetic observations and Okada coseismic approach. Numéro de notice : A2014-767 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1002/2014JB011280 Date de publication en ligne : 05/11/2014 En ligne : https://doi.org/10.1002/2014JB011280 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76915
in Journal of geophysical research : Solid Earth > vol 119 n° 12 (December 2014) . - pp 9095 - 9109[article]