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El campo de flujo de la zona de subducción a partir de la anisotropía sísmica: una visión global
Maureen D Long1, Paul G Silver
1Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, Washington, DC 20015, USA. long@dtm.ciw.edu
Science (New York, N.Y.)
|January 19, 2008
Resumen
El flujo del manto durante la subducción se entiende mejor mediante el análisis de la anisotropía sísmica. La velocidad de migración de la zanja influye en los patrones de flujo del manto debajo y dentro de la cuña del manto, interactuando con el flujo impulsado por la convergencia.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- La tectónica es la tectónica.
Sus antecedentes:
- Las morfologías de las placas de subducción se comprenden bien, pero el flujo del manto asociado sigue sin estar claro.
- La anisotropía sísmica, observada a través de la división de la onda de corte, ofrece información sobre el flujo del manto.
Objetivo del estudio:
- Para caracterizar los patrones de flujo del manto asociados con la subducción.
- Para investigar la relación entre la migración de zanjas y el flujo del manto.
Principales métodos:
- Compilado las observaciones de división de onda de corte de 13 zonas de subducción.
- Se analizaron las variaciones de anisotropía sísmica en relación con la velocidad de migración de la zanja (gadgadV(t).
Principales resultados:
- Variaciones sistemáticas observadas en la anisotropía manto-cuña y sub-slab con velocidad de migración de zanja.
- Identificó el flujo paralelo a la zanja, impulsado por el movimiento de la zanja, como dominante debajo de la losa.
- Se demostró que este flujo paralelo de trincheras escala de magnitud con V t {\displaystyle V_{t}}
- Interacción demostrada entre el flujo paralelo de zanja y el flujo de esquina impulsado por la convergencia en la cuña del manto.
Conclusiones:
- La velocidad de migración de la zanja es un factor clave que controla el flujo del manto durante la subducción.
- La influencia relativa del flujo de trinchera-paralelo y de la esquina depende de las magnitudes de V t y la velocidad de convergencia V c).
- La anisotropía sísmica revela efectivamente la compleja dinámica de flujo del manto.
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