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El adelgazamiento y el flujo de la corteza tibetana están limitados por la anisotropía sísmica
Nikolai M Shapiro1, Michael H Ritzwoller, Peter Molnar
1Center for Imaging the Earth's Interior, Department of Physics, University of Colorado at Boulder, Boulder, CO 80309, USA. nshapiro@ciei.colorado.edu
Science (New York, N.Y.)
|July 13, 2004
Resumen
El Tíbet es el Tíbet Tibet.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología.
- La tectónica de placas es la tectónica de placas.
Sus antecedentes:
- La compleja estructura geológica de la meseta tibetana.
- Comprender los procesos de deformación de la corteza.
Objetivo del estudio:
- Investigar la anisotropía de la corteza en el Tíbet.
- Determinar el alcance y la naturaleza del adelgazamiento de la corteza.
Principales métodos:
- Análisis de las ondas Rayleigh y Love de período intermedio.
- Modelado de propagación de ondas sísmicas.
- Análisis del tensor del momento del terremoto.
Principales resultados:
- Anisotropía radial significativa detectada en la corteza media-inferior.
- Hay evidencia de un adelgazamiento de la corteza terrestre de aproximadamente el 30%, particularmente en el oeste del Tíbet.
- Correlación entre la anisotropía sísmica y el adelgazamiento activo de la corteza.
- La orientación de los cristales de mica probablemente explica la anisotropía.
Conclusiones:
- La corteza media-inferior del Tíbet se ha adelgazado significativamente.
- La deformación sugiere una capa de flujo mecánicamente débil y canalizada.
- El adelgazamiento de la corteza es más pronunciado en la corteza media-inferior que en la corteza superior.
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