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Generation and study of satellite gravity over Gujarat, India and their possible correlation with earthquake occurences / T. Majumba in Geocarto international, vol 25 n° 4 (July 2010)  

Public [article]  inGeocarto international > vol 25 n° 4 (July 2010) . - pp 269 - 280 Titre : Generation and study of satellite gravity over Gujarat, India and their possible correlation with earthquake occurences Type de document : Article/Communication Auteurs : T. Majumba, Auteur ; R. Bhattacharyya, Auteur Année de publication : 2010 Article en page(s) : pp 269 - 280 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] anomalie de pesanteur [Termes IGN] champ de pesanteur local [Termes IGN] corrélation [Termes IGN] données GRACE [Termes IGN] épicentre [Termes IGN] Inde [Termes IGN] levé gravimétrique [Termes IGN] risque naturel [Termes IGN] séisme Résumé : (Auteur) High-resolution satellite gravity data have been generated and utilized to infer subsurface geological structures in the area of devastating earthquake that struck the Bhuj region in Gujarat on 26 January 2001. Latitudinal gravity profiles have been generated in the Bhuj, Anjar and IBF regions across the epicentres (23.5° N, 69.8° E/Mw 7.0 in 2001; 23.2° N, 70° E/Mw 7.0 in 1956; 24.2° N, 69.2° E/Mw 7.8 in 1819). Substantial differences in gravity anomaly patterns as high as 37 mGal could be observed existing near the epicentre regions. These gravitational differences might have caused due to the plate tectonic processes and due to the changes in densities of different lithospheric zones/sedimentary layers. Temporal variations of the satellite-derived gravity and their probable relations with already occurred major earthquakes in this region have been studied. Hence we conclude that drastic changes in gravity anomalies can be considered as a precursor for occurrences of substantially large earthquakes. Numéro de notice : A2010-278 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040903486148 Date de publication en ligne : 09/04/2010 En ligne : https://doi.org/10.1080/10106040903486148 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30472 [article]

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Generation of study of high-resolution satellite gravity over the Sumatra earthquake region / Samprit Chatterjee in International Journal of Remote Sensing IJRS, vol 28 n° 13-14 (July 2007)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 28 n° 13-14 (July 2007) . - pp 2915 - 2925 Titre : Generation of study of high-resolution satellite gravity over the Sumatra earthquake region Type de document : Article/Communication Auteurs : Samprit Chatterjee, Auteur ; R. Bhattacharyya, Auteur ; T.J. Majumdar, Auteur Année de publication : 2007 Article en page(s) : pp 2915 - 2925 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] anomalie de pesanteur [Termes IGN] carte gravimétrique [Termes IGN] déformation de la croute terrestre [Termes IGN] données altimétriques [Termes IGN] épicentre [Termes IGN] gravimétrie spatiale [Termes IGN] prévention des risques [Termes IGN] risque naturel [Termes IGN] séisme [Termes IGN] Sumatra [Termes IGN] tectonique des plaques Résumé : (Auteur) We have utilized satellite altimetry data to generate the very high-resolution gravity anomaly maps to infer subsurface geological structures in the area of the devastating earthquake (and the corresponding tsunami) that struck the Indian Ocean near Sumatra (Indonesia) on 26 December 2004. In the present study, a high-resolution three-dimensional (3D) gravity image has been generated over a part of the eastern Indian offshore encompassing the Sumatran earthquake region apart from Ninety East Ridge, Andaman subduction zone, etc. Four latitudinal (2°, 3°, 4° and 8.6° N) gravity profiles have been generated across the epicentre (3° N/M w 9.0)/aftershock regions (4° N/M w 5.8 and 8.6° N/M w 6.0 and 6.6). A drastic change of gravity anomaly patterns (sim130 mGal) near the epicentre and the aftershock regions could be observed, which are however slowly diminishing further away from the epicentre. This gravitational difference might have been caused by the differences in plate tectonic processes. Minor/major gravitational differences in other areas may be due to the changes in densities of different lithospheric zones/sedimentary layers. Hence, our study further supports the idea that negative gravity and topography anomalies can be used as a predictor for occurrences of large earthquakes in subduction zones. Copyright Taylor & Francis Numéro de notice : A2007-336 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160601091829 En ligne : https://doi.org/10.1080/01431160601091829 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28699 [article]

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