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Auteur Matthieu Ferry |
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Affiner la recherche Interroger des sources externesJoint inversion of ground gravity data and satellite gravity gradients between Nepal and Bhutan: New insights on structural and seismic segmentation of the Himalayan arc / Rodolphe Cattin in Physics and chemistry of the Earth (A/B/C), vol 123 (October 2021)
Titre : Joint inversion of ground gravity data and satellite gravity gradients between Nepal and Bhutan: New insights on structural and seismic segmentation of the Himalayan arc Type de document : Article/Communication Auteurs : Rodolphe Cattin, Auteur ; Théo Berthet, Auteur ; György Hetényi, Auteur ; Anita Thea Saraswati, Auteur ; Isabelle Panet Année de publication : 2021 Projets : TOPO-Extreme / Cattin, Rodolphe, TOSCA / Cattin, Rodolphe Article en page(s) : n° 103002 Note générale : bibliographie
This work was supported by grants from the Agence Nationale de la Recherche ANR-18-CE01-0017 and CNES TOSCA, as well as the Swiss National Science Foundation grant PP00P2_157627 (project OROG3NY).Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Bhoutan
[Termes IGN] gradient de gravitation
[Termes IGN] gravimétrie spatiale
[Termes IGN] Himalaya
[Termes IGN] levé gravimétrique
[Termes IGN] Népal
[Termes IGN] séismeRésumé : (auteur) Along-strike variation in the geometry of lithospheric structures is a key control parameter for the occurrence and propagation of major interplate earthquakes in subduction and collision zones. The lateral segmentation of the Himalayan arc is now well-established from various observations, including topography, gravity anomalies, exhumation rates, and present-day seismic activity. Good knowledge of the main geometric features of these segments and their boundaries is thus the next step to improve seismic hazard assessment in this area. Following recent studies, we focus our approach on the transition zone between Nepal and Bhutan where both M > 8 earthquakes and changes in the geometry of the Indian plate have been documented. Ground gravity data sets are combined with satellite gravity gradients provided by the GOCE mission (Gravity Field and Steady-State Ocean Circulation Explorer) in a joint inversion to assess the location and the geometry of this transition. We obtain a ca. 10 km wide transition zone located at the western border of Bhutan that is aligned with the Madhupur fault in the foreland and coincides with the Dhubri–Chungthang fault zone and the Yadong-Gulu rift in Himalaya and southern Tibet, respectively. This sharp segment boundary at depth can act as a barrier to earthquake rupture propagation. It can possibly restrict the size of large earthquakes and thus reduce the occurrence probability of M > 9 earthquakes along the Main Himalayan Thrust. Numéro de notice : A2021-500 Affiliation des auteurs : UMR IPGP-Géod+Ext (2020- ) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.pce.2021.103002 En ligne : https://doi.org/10.1016/j.pce.2021.103002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98261
in Physics and chemistry of the Earth (A/B/C) > vol 123 (October 2021) . - n° 103002[article]
Titre : Relative campaign during the International Comparison of Absolute Gravimeters ICAG-2005 and the strategy of data treatment combined with the absolute results Type de document : Article/Communication Auteurs : Zhiheng Jiang Editeur : [s.l.] : [s.n.] Année de publication : 2007 Conférence : IGFS 2006, 1st International Symposium of the International Gravity Field Service 28/08/2006 01/09/2006 Istanbul Turquie OA proceedings Importance : pp 375 - 380 Note générale : auteurs : Zhiheng Jiang 1 , Leonid Vitushkin1 , Matthias Becker2 , Olivier Francis3 , Philippe Jousset4 and Matthieu Ferry3 , François Dupont4 , Sébastien Deroussi5 , Laurent Métivier5 , Gwendaline Pajot5 , Chiungwu Lee6 , Chin-Lung Tsai 6 , Reinhard Falk7 , Herbert Wilmes7 , Alexander Kopaev8 , Diethard Ruess9 , Christian Ullrich9 , Bruno Meurers10, Jan Mrlina11, Vojtech Palinkas12, Jakub Kostelecky12, Franck Pereira13 , Michel van Ruymbeke14, Sébastien Naslin14 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] gravimètre absolu
[Termes IGN] gravimètre supraconducteur
[Termes IGN] gravimétrieRésumé : (auteur) As a tradition following the first International Comparison of Absolute Gravimeters in 1981 (Becker and Groten, 1983), during the 7 th International Comparison of Absolute Gravimeters (ICAG-2005) at the BIPM (Bureau International des Poids et Mesures), high precision relative gravity ties and vertical gradients were measured over the BIPM ICAG-network which includes sites with a gravity difference up to 9 mGal* . 12 institutes of 10 countries with 15 gravimeters of 6 different types were employed. We report in this paper the organisation of the relative campaign, the raw data analysis, the relative-only measurement adjustment and the combined adjustment of the relative and absolute data. Related problems issued during the measurements and data processing are introduced. When preparing the final version of this paper, the absolute g-values of the ICAG 2005 are not yet available (Vitushkin et al., IGFS2006). In consequence, results presented here are preliminary. The detailed analysis of adjusted g-values and gravimeter calibration etc. will be discussed in a forthcoming paper. The relative gravimetry raw data analysis, the comparison between the relative-only adjustment and the absolute-only adjustment shows that the uncertainty of an adjusted gravity difference given by the relative campaign is of the order of 1~2 µGal, probably ±1.3 µGal, and that of the gradient is of the order of 1~2 µGal/m. Numéro de notice : C2006-038 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Communication DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102795 Documents numériques
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