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Evidencia sísmica de agua en las profundidades del manto superior de la Tierra
Mark van der Meijde1, Federica Marone, Domenico Giardini
1Institute of Geophysics, Eidgenössische Technische Hochschule-Hönggerberg (HPP)/Swiss Federal Institute of Technology CH-8093 Zürich, Switzerland. mark@tomo.ig.erdw.ethz.ch
Science (New York, N.Y.)
|June 7, 2003
Resumen
El agua profunda del manto superior tiene un impacto significativo en las discontinuidades sísmicas. Una discontinuidad de 410 km, de 20 a 35 km de espesor, probablemente contiene hasta 700 ppm de agua, lo que influye en las propiedades de la zona de transición del manto.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- Física de los minerales Física de los minerales
Sus antecedentes:
- La zona de transición del manto (MTZ) exhibe discontinuidades sísmicas.
- El contenido de agua es un factor clave que influye en las propiedades del manto y el comportamiento de las ondas sísmicas.
Objetivo del estudio:
- Para investigar la influencia del agua profunda del manto superior en las discontinuidades sísmicas.
- Para determinar el contenido de agua responsable de una discontinuidad específica MTZ.
Principales métodos:
- Análisis de las ondas sísmicas convertidas.
- Modelación de la propagación de ondas sísmicas a través de estructuras heterogéneas del manto.
Principales resultados:
- Evidencia de una discontinuidad sísmica de 20 a 35 kilómetros de espesor a una profundidad de aproximadamente 410 km.
- Esta discontinuidad se explica mejor por la presencia de agua significativa, estimada en hasta 700 partes por millón en peso.
Conclusiones:
- El agua profunda del manto superior juega un papel crucial en la configuración de las propiedades de las discontinuidades sísmicas.
- La discontinuidad observada de 410 km es probablemente un límite de fase hidrosa o influenciada por minerales hidrosos.
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