Análisis de los esfuerzos tectónicos de la crisis sísmica de 2010 en Haití
The Mw=7 event of the January 12th, 2010 triggered a seismic crisis in the southern Haiti that continued for 3 months. The epicenter was located in an E-W oriented transpressive plate boundary where E-W trending left-lateral strike-slip and NW-SE trending compressive structures coexist (i.e., strain...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2014 |
| País: | España |
| Institución: | Universidad de Huelva (UHU) |
| Repositorio: | Arias Montano. Repositorio Institucional de la Universidad de Huelva |
| Idioma: | español |
| OAI Identifier: | oai:ariasmontano.uhu.es:10272/10620 |
| Acceso en línea: | http://hdl.handle.net/10272/10620 |
| Access Level: | acceso abierto |
| Palabra clave: | Active stresses Oblique tectonics Strain partitioning Hispaniola Haiti earthquake Esfuerzos activos Tectónica oblicua Deformación compartimentada La Española Terremoto de Haití |
| Sumario: | The Mw=7 event of the January 12th, 2010 triggered a seismic crisis in the southern Haiti that continued for 3 months. The epicenter was located in an E-W oriented transpressive plate boundary where E-W trending left-lateral strike-slip and NW-SE trending compressive structures coexist (i.e., strain partitioning).We carried out the stress inversion analysis over the focal mechanisms of the main event and 50 aftershocks. The main event was generated by a N084Eº 64º N-dipping fault with both a main left-lateral slip component and a reverse component. The aftershocks have been generated by ENEWSW pure reverse faults located in the area of interaction between the NWSE compressive structures and E-W strike-slip structures. These aftershocks have been activated by a very homogeneous uniaxial compressive stress regime with a σ1 horizontal trending 017º±10º. The absence of surface rupture indicates that the sources of the aftershocks are blind thrusts oriented 097º-117º. The interseismic surface convergence, derived from GPS velocities, shows an angular deviation of ≈30° related to the orientation of σ1 derived from the stress inversion analysis. This deviation strongly suggests that a significant part of the elastic energy accumulated along the E-W trending structures was not released during seismic crisis of 2010 |
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