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Auteur J.C. Rossignol |
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Ajouter le résultat dans votre panier Affiner la recherche Interroger des sources externesThe MW=8.1 Antofagasta (North Chile) Earthquake of July 30, 1995: First results from teleseismic and geodetic data / Jean-Claude Ruegg in Geophysical research letters, vol 23 n° 9 (01/05/1996)
Titre : The MW=8.1 Antofagasta (North Chile) Earthquake of July 30, 1995: First results from teleseismic and geodetic data Type de document : Article/Communication Auteurs : Jean-Claude Ruegg, Auteur ; J. Campos, Auteur ; R. Armijo, Auteur ; S. Barrientos, Auteur ; Pierre Briole, Auteur ; R. Thiele, Auteur ; M. Arancibia, Auteur ; J. Canuta, Auteur ; Thierry Duquesnoy Année de publication : 1996 Article en page(s) : pp 917 - 920 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] Chili
[Termes IGN] données géodésiques
[Termes IGN] modèle de déformation tectonique
[Termes IGN] séisme
[Termes IGN] tectonique des plaquesRésumé : (auteur) A strong (Mw = 8.1) subduction earthquake occurred on July 30, 1995 in Antofagasta (northern Chile). This is one of the largest events during this century in the region. It ruptured the southernmost portion of a seismic gap between 18°S and 25°S. In 1992 we had used GPS to survey a network with about 50 benchmarks covering a region nearly 500 km long (N-S) and 200 km wide (E-W). Part of these marks were re-surveyed with GPS after the 1995 earthquake. Comparison with 1992 positions indicate relative horizontal displacement towards the trench reaching 0.7 m. The inland subsided several decimeters. The Mejillones Peninsula was uplifted by more than 15 cm. Teleseismic body-wave modelling of VBB records gives a subduction focal mechanism and source time function with three distinct episodes of moment release and southward directivity. Modelling the displacement field using a dislocation with uniform slip in elastic half-space suggests a rupture zone with 19°–24° eastward dip extending to a depth no greater than 50 km with N-S length of 180 km and an average slip of about 5 m. The component of right-lateral slip inferred both from the teleseismic and geodetic data does not require slip partitioning at the plate boundary. That the well-constrained northern end of the 1995 rupture zone lies under the southern part of the Mejillones Peninsula increases the probability for a next rupture in the gap north of it. Numéro de notice : A1996-104 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/96GL01026 Date de publication en ligne : 01/05/1996 En ligne : https://doi.org/10.1029/96GL01026 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102938
in Geophysical research letters > vol 23 n° 9 (01/05/1996) . - pp 917 - 920[article]
