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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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Structure sismique de la zone de subduction des Petites Antilles : implications sur les dimensions de la zone sismogène interplaque ArchiMer
Evain, Mikael.
The Lesser Antilles is a case study of a very slow subduction (~2 cm/yr) of an old oceanic lithosphere (~84-100 Ma). The region presents a relatively low seismic activity, especially along the interplate contact, and the seismic hazard associated with a possible mega-thrust earthquake is still poorly known. This PhD thesis is a first step toward assessing the ability of the Lesser Antilles subduction zone to produce such a large subduction event. To do so, it aims at constraining the downdip width of the interplate's seismogenic zone. The lack of coverage of permanent seismological stations is a major limitation in the exploration of the Lesser Antilles subduction zone. It is due to the presence of only small aligned islands at far distances from the...
Tipo: Text Palavras-chave: Zone de subduction des Petites Antilles; Zone sismogene; Structure sismique; Sismicite; Tomographie sismique.; Lesser Antilles subduction zone; Seismogenic zone; Seismic structure; Seismicity; Seismic tomography..
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00172/28335/26628.pdf
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Thermal modeling of the SW Ryukyu forearc (Taiwan): Implications for the seismogenic zone and the age of the subducting Philippine Sea Plate (Huatung Basin) ArchiMer
Gutscher, M. -a.; Klingelhoefer, Frauke; Theunissen, T.; Spakman, W.; Berthet, T.; Wang, T. K.; Lee, C. -s..
Subduction mega-thrust earthquakes in the SW Ryukyu trench pose a seismic and tsunami hazard. One of the objectives of this study is to estimate the downdip width of the seismogenic zone using numerical modeling to determine the temperature distribution along the plate interface. However, this approach depends strongly on the thermal parameters of the subducting slab. While the Philippine Sea plate (PSP) subducting beneath the central and eastern Ryukyu arc is of Eocene age (35–50 Ma), its age west of the Gagua Ridge is uncertain, with proposed ages ranging from Lower Cretaceous (140 Ma) to Upper Eocene (35 Ma). Since the sparse available heat flow data are insufficient to resolve this debate, both end-member hypotheses are tested as input parameters. We...
Tipo: Text Palavras-chave: Subduction; Finite-element modeling; Forearc thermal structure; Seismogenic zone.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00324/43522/43054.pdf
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