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Termes IGN > sciences naturelles > sciences de la Terre et de l'univers > géosciences > géologie > tectonique > déformation de la croute terrestre
déformation de la croute terrestreSynonyme(s)mouvement de la croute terrestre déformation tectonique |
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Numerical modelling of post-seismic rupture propagation after the Sumatra 26.12.2004 earthquake constrained by GRACE gravity data / Valentin O. Mikhailov in Geophysical journal international, vol 194 n° 2 (August 2013)
[article]
Titre : Numerical modelling of post-seismic rupture propagation after the Sumatra 26.12.2004 earthquake constrained by GRACE gravity data Type de document : Article/Communication Auteurs : Valentin O. Mikhailov, Auteur ; V. Lyakhovsky, Auteur ; Isabelle Panet , Auteur ; Y. van Dinther, Auteur ; Michel Diament , Auteur ; T. Gerya, Auteur ; Olivier de Viron, Auteur ; Elena P. Timoshkina, Auteur Année de publication : 2013 Article en page(s) : pp 640 - 650 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] coordonnées GPS
[Termes IGN] déformation de la croute terrestre
[Termes IGN] données GRACE
[Termes IGN] faille géologique
[Termes IGN] levé gravimétrique
[Termes IGN] modèle de simulation
[Termes IGN] rhéologie
[Termes IGN] séisme
[Termes IGN] subductionRésumé : (auteur) In the last decades, the development of the surface and satellite geodetic and geophysical observations brought a new insights into the seismic cycle, documenting new features of inter-, co-, and post-seismic processes. In particular since 2002 satellite mission GRACE provides monthly models of the global gravity field with unprecedented accuracy showing temporal variations of the Earth's gravity field, including those caused by mass redistribution associated with earthquake processes. When combined with GPS measurements, these new data have allowed to assess the relative importance of afterslip and viscoelastic relaxation after the Sumatra 26.12.2004 earthquake. Indeed the observed post-seismic crustal displacements were fitted well by a viscoelastic relaxation model assuming Burgers body rheology for the asthenosphere (60–220 km deep) with a transient viscosity as low as 4 × 1017 Pas and constant ∼1019 Pas steady state viscosity in the 60–660-km depth range. However, even the low-viscosity asthenosphere provides the amplitude of strain which gravity effect does not exceed 50 per cent of the GRACE gravity variations, thus additional localized slip of about 1 m was suggested at downdip extension of the coseismic rupture. Post-seismic slip at coseismic rupture or its downdip extension has been suggested by several authors but the mechanism of the post-seismic fault propagation has never been investigated numerically. Depth and size of localized slip area as well as rate and time decay during the post-seismic stage were either assigned a priory or estimated by fitting real geodesy or gravity data. In this paper, we investigate post-seismic rupture propagation by modelling two consequent stages. First, we run a long-term, geodynamic simulation to self-consistently produce the initial stress and temperature distribution. At the second stage, we simulate a seismic cycle using results of the first step as initial conditions. The second short-term simulation involves three substeps, including additional stress accumulation after part of the subduction channel was locked; spontaneous coseismic slip; formation and development of damage zones producing afterslip. During the last substep post-seismic stress leads to gradual ∼1 m slip localized at three faults around ∼100-km downdip extension of the coseismic rupture. We used the displacement field caused by the slip to calculate pressure and density variations and to simulate gravity field variations. Wavelength of calculated gravity anomaly fits well to that of the real data and its amplitude provides about 60 per cent of the observed GRACE anomaly. Importantly, the surface displacements caused by the estimated afterslip are much smaller than those registered by GPS networks. As a result cumulative effect of Burgers rheology viscoelastic relaxation (which explains measured GPS displacements and about a half of gravity variations) plus post-seismic slip predicted by damage rheology model (which causes much smaller surface displacements but provides another half of the GRACE gravity variations) fits well to both sets of the real data. Hence, the presented numerical modelling based on damage rheology supports the process of post-seismic downdip rupture propagation previously hypothesized from the GRACE gravity data. Numéro de notice : A2013-820 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1093/gji/ggt145 Date de publication en ligne : 02/05/2013 En ligne : http://dx.doi.org/10.1093/gji/ggt145 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80192
in Geophysical journal international > vol 194 n° 2 (August 2013) . - pp 640 - 650[article]Impact of seasonal station motions on VLBI UT1 intensives results / Zinovy Malkin in Journal of geodesy, vol 87 n° 6 (June 2013)
[article]
Titre : Impact of seasonal station motions on VLBI UT1 intensives results Type de document : Article/Communication Auteurs : Zinovy Malkin, Auteur Année de publication : 2013 Article en page(s) : pp 505 - 514 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] déformation de la croute terrestre
[Termes IGN] erreur systématique
[Termes IGN] European VLBI network
[Termes IGN] interférométrie à très grande base
[Termes IGN] orientation de la Terre
[Termes IGN] positionnement par ITGB
[Termes IGN] station VLBI
[Termes IGN] variation saisonnièreRésumé : (Auteur) UT1 estimates obtained from the very long baseline interferometry (VLBI) Intensives data depend on the station displacement model used during processing. In particular, because of seasonal variations, the instantaneous station position during the specific intensive session differs from the position predicted by the linear model generally used. This can cause systematic errors in UT1 Intensives results. In this paper, we first investigated the seasonal signal in the station displacements for the 5 VLBI antennas participating in UT1 Intensives observing programs, along with the 8 collocated GPS stations. It was found that a significant annual term is present in the time series for most stations, and its amplitude can reach 8 mm in the height component, and 2 mm in horizontal components. However, the annual signals found in the displacements of the collocated VLBI and GPS stations at some sites differ substantially in amplitude and phase. The semiannual harmonics are relatively small and unstable, and for most stations no prevailing signal was found in the corresponding frequency band. Then two UT1 Intensives series were computed with and without including the seasonal term found in the previous step in the station movement model. Comparison of these series has shown that neglecting the seasonal station position variations can cause a systematic error in UT1 estimates, which can exceed 1us, depending on the observing program. Numéro de notice : A2013-338 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-013-0624-5 Date de publication en ligne : 24/02/2013 En ligne : https://doi.org/10.1007/s00190-013-0624-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32476
in Journal of geodesy > vol 87 n° 6 (June 2013) . - pp 505 - 514[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2013061 SL Revue Centre de documentation Revues en salle Disponible Devising stable geometrical reference frames for use in geodetic studies of vertical crustal motion / Michael Bevis in Journal of geodesy, vol 87 n° 4 (April 2013)
[article]
Titre : Devising stable geometrical reference frames for use in geodetic studies of vertical crustal motion Type de document : Article/Communication Auteurs : Michael Bevis, Auteur ; Abel Brown, Auteur ; Eric Kendrick, Auteur Année de publication : 2013 Article en page(s) : pp 311 - 321 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] déformation verticale de la croute terrestre
[Termes IGN] positionnement par GPS
[Termes IGN] repère de référenceRésumé : (Auteur) We present a method for constructing and assessing the stability of a geometrical reference frame for use in vertical crustal motion studies. Our approach exploits the fact that when we transform GPS velocity solutions from one reference frame (RF) to another one using a Helmert transformation, only the frame translation rate parameters produce significant changes in the vertical station velocities expressed in the final RF. Loosely speaking, one can select and impose a ‘vertical RF’ from an ensemble of candidate frames, without any reference to the ‘horizontal RF’ (which can be selected and imposed afterwards), by seeing how the frame translation rates vary as one moves across the ensemble of frames. We order this ensemble according to the number of stations, N, incorporated into the set VREF whose RMS vertical motion is minimized in order to realize each frame. The value of N controls the level of scatter in, and hence the degree of similarity between the vertical velocities of the stations composing VREF. We characterize a specific vertical RF as stable if all of the frames located in a large neighborhood of the ensemble which includes the specific frame are characterized by very small relative frame translation rates. In this case, the expression of vertical GPS station velocities in any of these frames would lead to very similar results. We present a case study using a very large global time series in which we find a large RF neighborhood in which vertical station velocities are globally stable at the ? 0.2 mm/year level, and a slightly smaller neighborhood in which vertical stability improves to ? 0.1 mm/year level in polar regions. Numéro de notice : A2013-216 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-012-0600-5 Date de publication en ligne : 03/11/2012 En ligne : https://doi.org/10.1007/s00190-012-0600-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32354
in Journal of geodesy > vol 87 n° 4 (April 2013) . - pp 311 - 321[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2013041 SL Revue Centre de documentation Revues en salle Disponible Earth System Mass Transport Mission (e.motion): A Concept for Future Earth Gravity Field Measurements from Space / Isabelle Panet in Surveys in Geophysics, vol 34 n° 2 (March 2013)
[article]
Titre : Earth System Mass Transport Mission (e.motion): A Concept for Future Earth Gravity Field Measurements from Space Type de document : Article/Communication Auteurs : Isabelle Panet , Auteur ; J. Flury, Auteur ; Richard Biancale, Auteur ; Thomas Gruber, Auteur ; J. Johannessen, Auteur ; M.R. van der Broeke, Auteur ; Tonie M. van Dam, Auteur ; P. Gegout, Auteur ; C. Hughes, Auteur ; Guillaume Ramillien, Auteur ; I. Sasgen, Auteur ; L. Seoane, Auteur ; M. Thomas, Auteur Année de publication : 2013 Article en page(s) : pp 141 - 163 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] déformation de la croute terrestre
[Termes IGN] données GRACE
[Termes IGN] gravimétrie spatiale
[Termes IGN] interférométrie à très grande base
[Termes IGN] masse d'eau
[Termes IGN] mission spatiale
[Termes IGN] satellite de télémétrie
[Termes IGN] Terre (planète)Résumé : (auteur) In the last decade, satellite gravimetry has been revealed as a pioneering technique for mapping mass redistributions within the Earth system. This fact has allowed us to have an improved understanding of the dynamic processes that take place within and between the Earth’s various constituents. Results from the Gravity Recovery And Climate Experiment (GRACE) mission have revolutionized Earth system research and have established the necessity for future satellite gravity missions. In 2010, a comprehensive team of European and Canadian scientists and industrial partners proposed the e.motion (Earth system mass transport mission) concept to the European Space Agency. The proposal is based on two tandem satellites in a pendulum orbit configuration at an altitude of about 370 km, carrying a laser interferometer inter-satellite ranging instrument and improved accelerometers. In this paper, we review and discuss a wide range of mass signals related to the global water cycle and to solid Earth deformations that were outlined in the e.motion proposal. The technological and mission challenges that need to be addressed in order to detect these signals are emphasized within the context of the scientific return. This analysis presents a broad perspective on the value and need for future satellite gravimetry missions. Numéro de notice : A2013-814 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s10712-012-9209-8 Date de publication en ligne : 31/10/2012 En ligne : http://dx.doi.org/10.1007/s10712-012-9209-8 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80127
in Surveys in Geophysics > vol 34 n° 2 (March 2013) . - pp 141 - 163[article]InSAR-derived coseismic deformation of the 2010 Southeastern Iran earthquake (M6.5) and its relationship with the tectonic background in the South of Lut Block / Tomokazu Kobayashi in Bulletin of the GeoSpatial Information authority of Japan, vol 60 (March 2013)
[article]
Titre : InSAR-derived coseismic deformation of the 2010 Southeastern Iran earthquake (M6.5) and its relationship with the tectonic background in the South of Lut Block Type de document : Article/Communication Auteurs : Tomokazu Kobayashi, Auteur ; Mikio Tobita, Auteur ; Akira Suzuki, Auteur ; Yuko Noguchi, Auteur Année de publication : 2013 Article en page(s) : pp 7 - 17 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] faille géologique
[Termes IGN] image ALOS-PALSAR
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] Iran
[Termes IGN] séisme
[Termes IGN] tectonique des plaquesRésumé : (Auteur) An inland crustal earthquake with a magnitude of 6.5 that occurred in the southeast of Iran on December 20, 2010 ruptured an unknown fault at depth. Applying interferometric SAR (InSAR) analysis using ALOS/PALSAR data to the earthquake, we detected the coseismic signal from both ascending orbit interferogram of fine beam mode and descending orbit interferogram of ScanSAR mode. Our preferred fault model, assuming a rectangular fault with a uniform slip, shows a nearly pure dextral fault motion with NE-SW-oriented strike. The estimated moment magnitude is 6.6. The fault of the mainshock is on the southern extension of the Kahurak fault, suggesting that the causative fault of this event is probably the identical fault system to the Kahurak fault. Numéro de notice : A2013-108 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://www.gsi.go.jp/common/000066400.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32246
in Bulletin of the GeoSpatial Information authority of Japan > vol 60 (March 2013) . - pp 7 - 17[article]VGI, Österreichische Zeitschrift für Vermessung & GeoInformation (Bulletin de VGI, Österreichische Zeitschrift für Vermessung & GeoInformation) / Österreichische Gesellschaft für Vermessung und Geoinformation (Autriche)PermalinkPermalinkTraitement automatique (GAMIT) des données GPS (campagnes-stations permanentes) pour les mesures de déformations à l'Etna / Sébastien Fancelli (2013)PermalinkMitigating the effects of vertical land motion in tide gauge records using a state-of-the-art GPS velocity field / Alvaro Santamaria Gomez in Global and Planetary Change, vol 98 - 99 (December 2012)PermalinkLe repère international de référence terrestre (ITRF) : état actuel et perspectives / Zuheir Altamimi in XYZ, n° 133 (décembre 2012 - février 2013)Permalink3D coseismic displacement of 2010 Darfield, New Zealand earthquake estimated from multi-aperture InSAR and D-InSAR measurements / J. Hu in Journal of geodesy, vol 86 n° 11 (November 2012)PermalinkOptimized Kalman filter versus rigorous method in deformation analysis / N. Aharizad in Journal of applied geodesy, vol 6 n° 3-4 (November 2012)PermalinkAn advanced algorithm for deformation estimation in non-urban areas / K. Goel in ISPRS Journal of photogrammetry and remote sensing, vol 73 (September 2012)PermalinkHydrological deformation induced by the West African Monsoon : Comparison of GPS, GRACE and loading models / Samuel Nahmani in Journal of geophysical research : Solid Earth, Vol 117 n° B5 (May 2012)PermalinkTagungsband: 11 österreichischer Geodätentag (Bulletin de VGI, Österreichische Zeitschrift für Vermessung & GeoInformation) / Österreichische Gesellschaft für Vermessung und Geoinformation (Autriche)Permalink