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Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
Published on: August 7, 2017
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Volcanología. volcanología. Un gran complejo magmático bajo la caldera de Toba
K Jaxybulatov1, N M Shapiro2, I Koulakov3
1Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of Russian Academy of Sciences, Prospekt Koptyuga, 3, Novosibirsk, 630090 Russia. Novosibirsk State University, 2, Pirogova Street, Novosibirsk 630090, Russia. Institut de Physique du Globe de Paris, Sorbonne Paris Cité, CNRS (UMR 7154), 1 rue Jussieu, 75238 Paris, Cedex 5, France.
Science (New York, N.Y.)
|November 1, 2014
Resumen
Los grandes reservorios volcánicos, como los que alimentan a los supervolcanes, pueden formarse como extensos complejos de sill. Este hallazgo apoya la evolución incremental de los cuerpos de magma que conducen a grandes erupciones volcánicas.
Área de la Ciencia:
- La geofísica es la geofísica.
- Volcanología Volcanología.
- Sismología Sismología Sismología.
Sus antecedentes:
- Comprender la formación de grandes depósitos magmáticos es crucial para evaluar los riesgos de futuras erupciones volcánicas.
- Los supervolcanes representan amenazas globales significativas, lo que hace necesaria la investigación de sus sistemas de magma.
Objetivo del estudio:
- Para estimar el tamaño y la madurez de un gran depósito volcánico utilizando anisotropía sísmica.
- Para investigar la estructura del sistema de magma de la caldera de Toba.
Principales métodos:
- La tomografía sísmica de ruido ambiental se empleó debajo de la caldera de Toba.
- Se analizó la anisotropía sísmica radial para inferir estructuras subterráneas.
Principales resultados:
- La anisotropía sísmica indica una estratificación a escala fina a menos de 7 km de profundidad.
- Esta estratificación se interpreta como numerosos umbrales parcialmente fundidos dentro de la corteza.
- El depósito magmático de Toba parece ser un gran complejo de umbrales.
Conclusiones:
- Los reservorios magmáticos de los supervolcanes pueden desarrollarse como extensos complejos de sill.
- Esto apoya la teoría de la evolución del cuerpo de magma a largo plazo, incremental, que conduce a grandes erupciones.
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