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Abril de 2012 sismicidad intraoceánica frente a Sumatra impulsado por el megathrust Banda-Aceh
Matthias Delescluse1, Nicolas Chamot-Rooke, Rodolphe Cattin
1Laboratoire de Géologie, Ecole Normale Supérieure and CNRS UMR8538, 75005 Paris, France. delescluse@geologie.ens.fr
Nature
|October 2, 2012
Resumen
Los terremotos intraplate, raros en alta mar, pueden ser provocados por eventos distantes de megathrust. La transferencia de estrés y la relajación del manto explican el momento de los terremotos de la cuenca de Wharton en 2012.
Área de la Ciencia:
- La geofísica es la geofísica.
- La tectónica es la tectónica.
- Sismología Sismología Sismología.
Sus antecedentes:
- Los grandes terremotos suelen ocurrir en los límites de las placas tectónicas.
- Los terremotos intraplacas, especialmente en alta mar, son raros y poco conocidos.
- Los terremotos de la cuenca de Wharton de 2012 fueron eventos de deslizamiento inusualmente grandes en un entorno intraoceánico.
Objetivo del estudio:
- Para investigar la causa de los terremotos de 2012 en la cuenca de Wharton.
- Para entender la relación entre los terremotos de megatrust y la deformación intraplate.
- Para analizar el papel de la transferencia de estrés y la dinámica del manto en el desencadenamiento de eventos intraplaquetarios.
Principales métodos:
- Análisis de los terremotos de la cuenca de Wharton de 2012 y sus réplicas.
- Cálculos de cambio de tensión de Coulomb para modelar la transferencia de tensión.
- Investigación de la relajación viscosa en el manto astenosférico.
Principales resultados:
- Los terremotos de 2012 estuvieron relacionados con los cambios de estrés de los terremotos de 2004 en Aceh y 2005 en Nias.
- Estos cambios de tensión promovieron fallas de deslizamiento en aviones preexistentes.
- La relajación viscosa en el manto explica el retraso en el tiempo entre los eventos megatrust e intraplate.
Conclusiones:
- Los terremotos de megatrust pueden desencadenar terremotos intraplacas en alta mar a través de la transferencia de estrés.
- La dinámica del manto juega un papel crucial en el momento de los eventos sísmicos intraplacas.
- Los hallazgos ofrecen información sobre la tectónica de placas y la evolución del sistema de placas India-Australia.
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