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Almacenamiento de magma debajo del volcán Axial en la cresta oceánica de Juan de Fuca

M West¹, W Menke, M Tolstoy

¹Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, USA. mwest@ldeo.columbia.edu

|October 26, 2001

Resumen

El volcán axial alberga un gran sistema de magma, estimado en 521 km3, que excede con creces los volúmenes de erupciones recientes. Esto sugiere el volcán.

Área de la Ciencia:

La geofísica es la geofísica.
Volcanología Volcanología.
Sismología Sismología Sismología.

Sus antecedentes:

El volcán axial es una montaña submarina volcánica cerca de la cordillera de Juan de Fuca.
Está asociado con el punto caliente de Cobb y entró en erupción en 1998.

Objetivo del estudio:

Para investigar la estructura tridimensional de velocidad sísmica debajo del volcán Axial.
Para estimar el volumen y las características del sistema de magma subyacente.

Principales métodos:

Análisis de los datos sismológicos.
Imagen de la estructura de velocidad subterránea.

Principales resultados:

Se identificó una gran zona de baja velocidad en la corteza, que comprende una cámara de magma poco profunda y un depósito más profundo.
El volumen total de magma se estima entre 5 y 21 km3.
Este volumen es significativamente mayor (dos órdenes de magnitud) que el de la fusión que estalló en 1998.

Conclusiones:

Las erupciones volcánicas en el volcán Axial extraen sólo una pequeña fracción de la reserva total de magma.
El sistema de magma es probablemente de larga duración en relación con los ciclos de erupción.
El tiempo estimado de residencia de la corteza terrestre para el derretimiento oscila entre unos pocos cientos y unos pocos miles de años.

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