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Un gran terremoto duplicado y ciclo de transferencia de estrés sísmico en las islas Kuriles centrales
Charles J Ammon1, Hiroo Kanamori, Thorne Lay
1Department of Geosciences, The Pennsylvania State University, 440 Deike Building, University Park, Pennsylvania 16802, USA.
Nature
|February 1, 2008
Resumen
Dos grandes terremotos cerca de las Islas Kuriles revelaron cómo la fricción de la falla límite de la placa influye en la actividad sísmica. Esta secuencia destaca la transferencia de tensiones y el aumento de los peligros sísmicos en las placas de subducción.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología.
- La tectónica es la tectónica.
Sus antecedentes:
- Las fallas del límite de la placa de la zona de subducción experimentan resistencia a la fricción durante los ciclos sísmicos.
- Se cree que esta fricción influye en el estrés y la actividad sísmica dentro de la placa de subducción.
- Eventos de compresión anteriores sugirieron resistencia por fricción cerca de las Islas Kuriles.
Objetivo del estudio:
- Para investigar la relación entre la resistencia a la fricción y el desencadenamiento de fallas.
- Para demostrar el aumento del riesgo sísmico asociado con tales eventos.
- Para iluminar las diferencias en las propiedades sísmicas y los peligros de las fallas interplacas e intraplacas.
Principales métodos:
- Análisis de dos grandes terremotos cerca de las Islas Kuriles (noviembre de 2006 y enero de 2007).
- Examen de las características de la ruptura y los procesos de transferencia de tensión.
- Evaluación de las implicaciones del peligro sísmico.
Principales resultados:
- Un terremoto de magnitud 8,3 rompió el límite de la placa de inmersión poco profunda.
- En cuestión de minutos, los terremotos extensivos intraplate iniciados en la elevación externa.
- Un posterior terremoto de magnitud 8.1 rompió una falla normal en la placa subductora del Pacífico.
Conclusiones:
- La secuencia de terremotos demuestra una transferencia significativa de estrés dentro de la litosfera subductora.
- Las distintas características de ruptura resaltan diferentes propiedades sismogénicas.
- Estos eventos subrayan el mayor peligro sísmico de fallas desencadenadas en las zonas de subducción.
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