Mostrar el registro sencillo del ítem Chlieh, Mohamed Perfettini, Hugo Tavera, Hernando Avouac, Jean-Philippe Remy, Dominique Nocquet, Jean-Mathieu Rolandone, Frédérique Bondoux, Francis Gabalda, Germinal Bonvalot, Sylvain 2018-07-25T12:42:45Z 2018-07-25T12:42:45Z 2011-12-17
dc.identifier.govdoc index-oti2018 (NB)
dc.identifier.issn 2169-9356
dc.description En: Journal of Geophysical Research: Solid Earth, v. 116, n. B12 (December 2011), p. B12405, 1-21. es_ES
dc.description.abstract "We use about two decades of geodetic measurements to characterize interseismic strain build up along the Central Andes subduction zone from Lima, Peru, to Antofagasta, Chile. These measurements are modeled assuming a 3-plate model (Nazca, Andean sliver and South America Craton) and spatially varying interseismic coupling (ISC) on the Nazca megathrust interface. We also determine slip models of the 1996 Mw = 7.7 Nazca, the 2001 Mw = 8.4 Arequipa, the 2007 Mw = 8.0 Pisco and the Mw = 7.7 Tocopilla earthquakes. We find that the data require a highly heterogeneous ISC pattern and that, overall, areas with large seismic slip coincide with areas which remain locked in the interseismic period (with high ISC). Offshore Lima where the ISC is high, a Mw=8.6–8.8 earthquake occurred in 1746. This area ruptured again in a sequence of four Mw=8.0 earthquakes in 1940, 1966, 1974 and 2007 but these events released only a small fraction of the elastic strain which has built up since 1746 so that enough elastic strain might be available there to generate a Mw > 8.5 earthquake. The region where the Nazca ridge subducts appears to be mostly creeping aseismically in the interseismic period (low ISC) and seems to act as a permanent barrier as no large earthquake ruptured through it in the last 500 years. In southern Peru, ISC is relatively high and the deficit of moment accumulated since the Mw=8.8 earthquake of 1868 is equivalent to a magnitude Mw=8.4 earthquake. Two asperities separated by a subtle aseismic creeping patch are revealed there. This aseismic patch may arrest some rupture as happened during the 2001 Arequipa earthquake, but the larger earthquakes of 1604 and 1868 were able to rupture through it. In northern Chile, ISC is very high and the rupture of the 2007 Tocopilla earthquake has released only 4% of the elastic strain that has accumulated since 1877. The deficit of moment which has accumulated there is equivalent to a magnitude Mw=8.7 earthquake. This study thus provides elements to assess the location, size and magnitude of future large megathurst earthquakes in the Central Andes subduction zone. Caveats of this study are that interseismic strain of the forearc is assumed time invariant and entirely elastic. Also a major source of uncertainty is due to fact that the available data place very little constraints on interseismic coupling at shallow depth near the trench, except offshore Lima where sea bottom geodetic measurements have been collected suggesting strong coupling." es_ES
dc.format application/pdf es_ES
dc.language.iso eng es_ES
dc.publisher American Geophysical Union es_ES
dc.relation.uri es_ES
dc.rights info:eu-repo/semantics/restrictedAccess es_ES
dc.rights.uri info:eu-repo/semantics/restrictedAccess es_ES
dc.source Repositorio institucional - IGP es_ES
dc.subject Zonas de subducción es_ES
dc.subject Ondas sísmicas es_ES
dc.subject Sistema de posicionamiento global es_ES
dc.subject Terremotos--Perú es_ES
dc.subject Terremotos--Chile es_ES
dc.subject Geodesia--Mediciones es_ES
dc.title Interseismic coupling and seismic potential along the Central Andes subduction zone es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.subject.ocde Terremotos es_ES
dc.subject.ocde Perú es_ES
dc.subject.ocde Chile es_ES
dc.subject.ocde Geofísica es_ES
dc.subject.ocde Medición es_ES
dc.subject.ocde Sismos es_ES
dc.subject.ocde Medición es_ES
dc.identifier.journal Journal of Geophysical Research: Solid Earth es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi 10.1029/2010JB008166 es_ES




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