Détail de l'auteur
Auteur H. Lyon-Caen |
Documents disponibles écrits par cet auteur (2)
Ajouter le résultat dans votre panier Affiner la recherche Interroger des sources externesKinematics of the North American–Caribbean-Cocos plates in Central America from new GPS measurements across the Polochic-Motagua fault system / H. Lyon-Caen in Geophysical research letters, vol 33 n° 19 (Octobre 2006)
Titre : Kinematics of the North American–Caribbean-Cocos plates in Central America from new GPS measurements across the Polochic-Motagua fault system Type de document : Article/Communication Auteurs : H. Lyon-Caen, Auteur ; E. Barrier, Auteur ; Cécile Lasserre, Auteur ; A. Franco, Auteur ; I. Arzu, Auteur ; L. Chiquin, Auteur ; M. Chiquin, Auteur ; Thierry Duquesnoy Année de publication : 2006 Article en page(s) : n° L19309 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] Amérique centrale
[Termes IGN] Amérique du nord
[Termes IGN] déformation de la croute terrestre
[Termes IGN] faille géologique
[Termes IGN] subduction
[Termes IGN] tectonique des plaquesRésumé : (auteur) The Polochic-Motagua strike-slip fault system in Guatemala marks the on-land plate boundary between the North American (NA) and the Caribbean (CA) plates. GPS observations in 1999 and 2003 show that the far-field velocity across the system (NA-CA relative velocity) is ∼20 mm/yr. This is significantly higher than the NUVEL-1A velocity but is consistent with the GPS based CA-NA velocity proposed by DeMets et al. (2000). The observations are modeled by a fault centered on the Motagua fault, locked at a depth of 20 km, with a slip-rate decreasing from eastern to central Guatemala from 20 to 12 mm/yr towards the NA-CA-Cocos triple junction. This decrease is accommodated by ∼8 mm/yr of E-W extension in the westernmost part of CA south of the Motagua fault. About 10 mm/yr of dextral slip is observed across the Mid-American Volcanic Arc. The NA-CA-Cocos triple junction is thus a complex, ∼400 km-wide wedge-shaped area. Numéro de notice : A2006-676 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2006GL027694 Date de publication en ligne : 11/10/2006 En ligne : https://doi.org/10.1029/2006GL027694 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102947
in Geophysical research letters > vol 33 n° 19 (Octobre 2006) . - n° L19309[article]
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]
