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Sismología: riesgo de terremotos en la zanja de Sunda
Suleyman S Nalbant1, Sandy Steacy, Kerry Sieh
1School of Environmental Sciences, University of Ulster, Coleraine, County Derry BT52 1SA, UK.
Nature
|June 10, 2005
Resumen
El terremoto de Sunda de 2005 fue provocado por el evento Sumatra-Andamán de 2004. Esta actividad sísmica aumentó la tensión en el megatrust sur, por lo que es un candidato para futuros terremotos.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- La tectónica es la tectónica.
Sus antecedentes:
- El megatrust de Sunda experimentó un gran terremoto el 28 de marzo de 2005, después de un evento similar en diciembre de 2004.
- Esta ruptura de 2005 estaba conectada espacialmente con el terremoto de Sumatra-Andamán de 2004.
Objetivo del estudio:
- Para investigar los mecanismos de activación y la transferencia de estrés después del terremoto de Sunda megathrust 2005.
- Para evaluar el potencial sísmico de los segmentos y fallas megathrust adyacentes.
Principales métodos:
- Análisis de los datos sísmicos del terremoto de 2005.
- Modelado de estrés para calcular los cambios de estrés en las estructuras tectónicas cercanas.
- Revisión de los datos paleosísmicos para el segmento de Mentawai.
Principales resultados:
- El terremoto de 2005 fue provocado por tensiones muy pequeñas (aproximadamente 0,1 bar).
- La ruptura aumentó la tensión en el megathrust al sur de la zona de ruptura, cerca de las islas Batu y Mentawai.
- El aumento de la tensión también se observó en la falla de Sumatra.
- La evidencia paleosísmica indica que el segmento de Mentawai se encuentra en una etapa tardía de su ciclo sísmico.
Conclusiones:
- El terremoto de Sunda megathrust de 2005 fue una consecuencia de la transferencia de estrés del evento de 2004.
- El segmento Mentawai del megatrust Sunda es muy susceptible a futuros terremotos provocados debido a su avanzado ciclo sísmico.
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