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Auteur Jean-Michel Lemoine |
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Affiner la recherche Interroger des sources externesMigrating pattern of deformation prior to the Tohoku-Oki earthquake revealed by GRACE data / Isabelle Panet in Nature geoscience, vol 11 n° 5 (May 2018)
Titre : Migrating pattern of deformation prior to the Tohoku-Oki earthquake revealed by GRACE data Type de document : Article/Communication Auteurs : Isabelle Panet Année de publication : 2018 Projets : 1-Pas de projet / Article en page(s) : pp 367 - 373 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] déformation de la croute terrestre
[Termes IGN] données GRACE
[Termes IGN] Japon
[Termes IGN] risque naturel
[Termes IGN] séisme
[Termes IGN] subduction
[Termes IGN] tectonique des plaquesRésumé : (auteur) Understanding how and when far-field continuous motions lead to giant subduction earthquakes remains a challenge. An important limitation comes from an incomplete description of aseismic mass fluxes at depth along plate boundaries. Here we analyse Earth’s gravity field variations derived from GRACE satellite data in a wide space-time domain surrounding the Mw 9.0 2011 Tohoku-Oki earthquake. We show that this earthquake is the extreme expression of initially silent deformation migrating from depth to the surface across the entire subduction system. Our analysis indeed reveals large-scale gravity and mass changes throughout three tectonic plates and connected slabs, starting a few months before March 2011. Before the Tohoku-Oki earthquake rupture, the gravity variations can be explained by aseismic extension of the Pacific plate slab at mid-upper mantle depth, concomitant with increasing seismicity in the shallower slab. For more than two years after the rupture, the deformation propagated far into the Pacific and Philippine Sea plate interiors, suggesting that subduction accelerated along 2,000 km of the plate boundaries in March 2011. This gravitational image of the earthquake’s long-term dynamics provides unique information on deep and crustal processes over intermediate timescales, which could be used in seismic hazard assessment. Numéro de notice : A2018-118 Affiliation des auteurs : LaSTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1038/s41561-018-0099-3 Date de publication en ligne : 09/04/2018 En ligne : https://doi.org/10.1038/s41561-018-0099-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89558
in Nature geoscience > vol 11 n° 5 (May 2018) . - pp 367 - 373[article]
Titre : GRACE gravitational signature of the 2011 Mw 9.0 Tohoku-oki earthquake Type de document : Article/Communication Auteurs : Isabelle Panet Editeur : Munich [Allemagne] : European Geosciences Union EGU Année de publication : 2018 Collection : Geophysical Research Abstracts, ISSN 1607-7962 num. 20 Conférence : EGU 2018, General Assembly 08/04/2018 13/04/2018 Vienne Autriche OA Abstracts only Note générale : EGU2018-9714 Langues : Anglais (eng) Résumé : (auteur) We present a analysis of the 2011 Mw 9.0 Tohoku-oki earthquake gravity variations in a wide space-time window surrounding the event. We identify earthquake-related gravity signals by searching for transient variations near the time of the earthquake in GRACE-reconstructed time series of gravity gradients at different spatial scales. The gravity gradients are expressed in spherical frames rotated along the radial axis in order to enhance gravity variations according to different orientations. Applied to different sets of gravity field models, our analysis allows us to evidence anomalous gravity signals starting a few months before the rupture across the regional subduction system, which cannot be explained by mass redistributions from water cycle sources around Japan nor by GRACE striping. After the rupture, the gravity variations propagate far within the Pacific and the Philippine Sea plates interiors.We further test the presence of the pre-seismic signals by also applying a statistical analysis of the gravity gradient time series, without knowledge on the consecutive rupture. Our findings show that satellite gravity brings unique information to monitor major plate boundaries, which could be used in seismic hazard assessment. Numéro de notice : C2018-070 Affiliation des auteurs : LaSTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Poster nature-HAL : Poster-avec-CL DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91462
Titre : Mass redistributions of the 2011 Mw 9.0 Tohoku-oki earthquake from GRACE Type de document : Article/Communication Auteurs : Isabelle Panet Editeur : Munich [Allemagne] : European Geosciences Union EGU Année de publication : 2018 Collection : Geophysical Research Abstracts, ISSN 1607-7962 num. 20 Conférence : EGU 2018, General Assembly 08/04/2018 13/04/2018 Vienne Autriche OA Abstracts only Note générale : EGU2018-9770 Langues : Anglais (eng) Résumé : (auteur) Large-scale gravity variations associated with the deformations surrounding giant earthquakes are one way to probe the rheology of the Earth’s upper mantle. They can be described from the GRACE mission data at temporal scales of months to years, and spatial scales inbetween those of local and global plate dynamics. Here, we consider the case of the 2011 Mw 9.0 Tohoku-oki earthquake and perform a space-time analysis of the GRACE geoid time series in a wide domain surrounding the event. In addition to the near-epicentral signals, we evidence regional-scale gravity variations starting a few months before the rupture, and propagating far within the Pacific and Philippine Sea plate interiors after the event. The gravity signals suggests that the earthquake is part of a broadscale deformation migrating from depth to surface across the entire subduction system, involving precursory slab extension at midupper mantle depths. We discuss the implications of these results, which provide unique evidence for episodic mass transfers at timescales of months in-depth of the plates boundaries. Numéro de notice : C2018-055 Affiliation des auteurs : LaSTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComSansActesPubliés-Unpublished DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91466
Titre : Laser ranging data analysis for a colocation campaign of French Transportable Laser Ranging System (FTLRS) in Tahiti Type de document : Article/Communication Auteurs : Xiaoni Wang, Auteur ; Pascal Bonnefond, Auteur ; Pierre Exertier, Auteur ; David Coulot Année de publication : 2015 Article en page(s) : pp 1 - 11 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] analyse comparative
[Termes IGN] co-positionnement
[Termes IGN] données DORIS
[Termes IGN] données GPS
[Termes IGN] données Lageos
[Termes IGN] données Starlette
[Termes IGN] données TLS (télémétrie)
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] point de liaison (géodésie)
[Termes IGN] Tahiti
[Termes IGN] télémétrie laser transportableRésumé : (auteur) Tahiti is a unique geodetic site located in the south Pacific Ocean where few observatories exist nearby. The American mobile station MOBLAS-8 was installed in Tahiti in 1998, and GPS and DORIS systems were also deployed in its vicinity in order to develop this site into one of the fundamental colocated sites of the International Terrestrial Reference Frame. In order to make a new estimate of the colocation differences between the different techniques, a campaign of the French Transportable Laser Ranging System (FTLRS) was conducted in Tahiti between April and October 2011. The FTLRS was deployed close to the existing equipment. Observations for LAGEOS 1, LAGEOS 2 and Starlette were studied, and the solutions to the local ties between FTLRS, MOBLAS-8, DORIS and GPS were evaluated. Our results of the geodetic local-ties between laser stations and GPS agree well with the measurements made by the Institut National de l’Information Géographique et Forestière (IGN) during the campaign, with differences less than 2 mm in the vertical direction. The laser station range biases as a function of satellites are also presented, −3 (±2) mm for MOBLAS-8 and 3 (±3) mm for FTLRS, respectively. In addition, we investigated the role of time bias (ranging from a few hundreds of nanoseconds to one microsecond) given by the Time Transfer by Laser Link experiment, which shows a limited impact on the present SLR analysis. We also compared the coordinates of the three available techniques at Tahiti, i.e., laser, GPS and DORIS. We found the accuracy of laser solutions still needs to be improved, so that the SLR at Tahiti could contribute more effectively to the tracking of satellites and thus to the international reference frame. This study is useful in evaluating the SLR and other space techniques in order to prepare the deployment of new equipment in Tahiti in the near future. Numéro de notice : A2015-230 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-014-0755-3 En ligne : https://doi.org/10.1007/s00190-014-0755-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76064
in Journal of geodesy > vol 89 n° 1 (January 2015) . - pp 1 - 11[article]
Titre : Quality assessment of SLR data-related products Type de document : Article/Communication Auteurs : Jean-Michel Lemoine, Auteur ; Florent Deleflie, Auteur ; Franck Reinquin, Auteur ; David Coulot Editeur : Greenbelt (Maryland) : Goddard Space Flight Center Année de publication : 2014 Conférence : Laser Ranging 2013, 18th international workshop on Laser Ranging 11/11/2013 15/11/2013 Fujiyoshida Japon OA Proceedings Importance : 6 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] données TLS (télémétrie)
[Termes IGN] évaluation des données
[Termes IGN] qualité des donnéesRésumé : (auteur) We analyse SLR data-related products that are computed from Lageos-1 and Lageos-2 data acquired by the ILRS network. We analyze time series of post-fit residuals for both satellites, biases and space stations coordinates (SSCs), that are deduced following the recommendations provided by the Analysis Working Group. We compute the same kind of products, with a GRGS updated version of SLRF2008. Finally, we propose a change in the operational strategy to improve the accuracy of the products delivered by the ILRS. Numéro de notice : C2013-003 Affiliation des auteurs : LaSTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : http://cddis.gsfc.nasa.gov/lw18/docs/papers/Session3/13-02-04-Deleflie.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78577 Documents numériques
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