| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
The 2010 Haiti earthquake: A complex fault pattern constrained by seismologic and tectonic observations
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| Autores: |
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
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| Data: |
2011-11
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| Ano: |
2011
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| Resumo: |
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 fault, this fault had an important role as a mechanical boundary. The azimuth of the focal planes of the aftershocks are parallel to the north-dipping faults of the Transhaitian Belt, which suggests a triggering of failure on these discontinuities. In the western part, the aftershock distribution reflects the triggering of slip on similar faults, and/or, alternatively, of the south-dipping faults, such the Trois-Baies submarine fault. These observations are in agreement with a model of an oblique collision of an indenter of the oceanic crust of the Southern Peninsula and the sedimentary wedge of the Transhaitian Belt: the rupture occurred on a wrench fault at the rheologic boundary on top of the under-thrusting rigid oceanic block, whereas the aftershocks were the result of the relaxation on the hanging wall along pre-existing discontinuities in the frontal part of the Transhaitian Belt. Citation: Mercier de Lepinay, B., et al. (2011), The 2010 Haiti earthquake: A complex fault pattern constrained by seismologic and tectonic observations, Geophys. Res. Lett., 38, L22305, doi:10.1029/2011GL049799.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/00054/16557/14071.pdf
DOI:10.1029/2011GL049799
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| Editor: |
Amer Geophysical Union
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| Relação: |
http://archimer.ifremer.fr/doc/00054/16557/
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| Formato: |
application/pdf
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| Fonte: |
Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2011-11 , Vol. 38 , N. L22305 , P. 7 p.
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| Direitos: |
2011 by the American Geophysical Union
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