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Giant seabed polygons and underlying polygonal faults in the Caribbean Sea as markers of the sedimentary cover extension in the Grenada Basin ArchiMer
Gay, Aurelien; Padron Mora, Crelia; Meyer, Solene; Beaufort, Daniel; Oliot, Emilien; Lallemand, Serge E; Marcaillou, Boris; Philippon, Mélody; Cornée, Jean-jacques; Audemard, Franck A; Lebrun, Jean-frédéric; Klingelhoefer, Frauke; Mercier De Lepinay, Bernard; Munch, Philippe; Garrocq, Clément; Boucart, Milton; Laigle, Mireille; Schenini, Laure; The Garanti Cruise Team,.
Based on an extensive seismic and multibeam dataset, 1-5 km wide giant polygons were identified at the bottom of the Grenada basin, covering a total area of ~55000 km². They represent the top part of an active underlying polygonal fault system due to the volumetric contraction of clay- and smectite-rich sediments during burial. To date, this is the widest area of outcropping polygonal faults ever found on Earth. The seabed polygons are bounded by rectilinear ~1000-1500 m wide and ~10-60 m deep furrows, depending on the location in the basin. They are relatively regular in the north Grenada Basin, whereas they are getting longer and more elongated in the south Grenada Basin. The polygonal faults consist in a set of discrete normal faults affecting...
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Ano: 2021 URL: https://archimer.ifremer.fr/doc/00688/79963/82891.pdf
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How wide is the seismogenic zone of the Lesser Antilles forearc? ArchiMer
Gutscher, Marc-andre; Westbrook, Graham; Marcaillou, Boris; Graindorge, David; Gailler, Audrey; Pichot, Thibaud; Maury, Rene.
The Lesser Antilles subduction zone has produced no recent strong thrust earthquakes, making it difficult to quantify the seismic hazard from such events. The Lesser Antilles arc has a low subduction rate and an accretionary wedge that is very wide at its southern end. To investigate the effect of the wedge on seismogenesis, numerical models of forearc thermal structure were constructed along six transects perpendicular to the arc in order to determine the thermally predicted width of the seismogenic zone. The geometry of each section is constrained by published seismic profiles and crustal models derived from gravity and seismic data and by earthquake hypocenters at depth. A major constraint on the deep part of the model is that mantle temperature beneath...
Tipo: Text Palavras-chave: Zone sismogène; Séisme chevauchant; Modélisation thermique; Prisme d’accrétion; Petites Antilles; Seismogenic zone; Thrust earthquake; Thermal modeling; Accretionary wedge; Lesser Antilles.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00140/25140/29432.pdf
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The 2010 Haiti earthquake: A complex fault pattern constrained by seismologic and tectonic observations ArchiMer
De Lepinay, Bernard Mercier; Deschamps, Anne; Klingelhoefer, Frauke; Mazabraud, Yves; Delouis, Bertrand; Clouard, Valerie; Hello, Yann; Crozon, Jacques; Marcaillou, Boris; Graindorge, David; Vallee, Martin; Perrot, Julie; Bouin, Marie-paule; Saurel, Jean-marie; Charvis, Philippe; St-louis, Mildor.
After the January 12, 2010, Haiti earthquake, we deployed a mainly offshore temporary network of seismologic stations around the damaged area. The distribution of the recorded aftershocks, together with morphotectonic observations and mainshock analysis, allow us to constrain a complex fault pattern in the area. Almost all of the aftershocks have a N-S compressive mechanism, and not the expected left-lateral strike-slip mechanism. A first-order slip model of the mainshock shows a N264 degrees E north-dipping plane, with a major left-lateral component and a strong reverse component. As the aftershock distribution is sub-parallel and close to the Enriquillo fault, we assume that although the cause of the catastrophe was not a rupture along the Enriquillo...
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00054/16557/14071.pdf
Registros recuperados: 3
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