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La alta presión del fluido de los poros puede causar un deslizamiento silencioso en el canal de Nankai
Shuichi Kodaira1, Takashi Iidaka, Aitaro Kato
1Institute for Frontier Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Showa-machi 3175-25 Kanazawa-ku, Yokohama 236-0001, Japan.
Science (New York, N.Y.)
|May 29, 2004
Resumen
Los científicos identificaron la causa de los eventos de deslizamiento silencioso en las zonas de subducción utilizando imágenes sísmicas. Se descubrió que la alta presión del fluido poroso en la corteza oceánica subducida genera estos terremotos lentos.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- La tectónica es la tectónica.
Sus antecedentes:
- Los eventos de deslizamiento silencioso, también conocidos como terremotos lentos, ocurren en zonas de subducción, pero sus causas subyacentes siguen siendo poco conocidas.
- Investigaciones anteriores han detectado estos eventos a nivel mundial, destacando una brecha significativa en nuestra comprensión de la dinámica de los terremotos.
Objetivo del estudio:
- Para investigar los mecanismos causales detrás de los eventos de deslizamiento silencioso.
- Para identificar las estructuras y condiciones geológicas específicas responsables del evento de deslizamiento silencioso de Tokai.
Principales métodos:
- Utilizó técnicas avanzadas de imágenes sísmicas para visualizar estructuras subterráneas.
- Analizaron los datos sísmicos para identificar zonas de propiedades físicas anómalas dentro de la corteza oceánica subductora.
Principales resultados:
- Se detectó una zona distinta de alta presión del fluido poroso dentro de la corteza oceánica subducida durante el deslizamiento silencioso de Tokai.
- Esta zona de alta presión estaba ubicada a la baja de una cresta oceánica subducida, lo que sugiere un control estructural.
Conclusiones:
- La zona de alta presión de fluido poroso identificada expande efectivamente la región de deslizamiento condicionalmente estable.
- Estas condiciones se proponen como el mecanismo principal que genera eventos de deslizamiento silencioso en esta zona de subducción.
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