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Evidencia geodésica de una baja tasa de deslizamiento en el sistema de fallas de Altyn Tagh
1CIRES & Department of Geological Sciences, University of Colorado, Boulder 80309-0399, USA.
Nature
|March 15, 2000
Resumen
Los datos geodésicos revelan el sistema de fallas de Altyn Tagh.
Área de la Ciencia:
- La geofísica es la geofísica.
- La tectónica es la tectónica.
- La geodesia es una técnica de geodesia.
Sus antecedentes:
- La colisión India-Asia conduce a la deformación en todo el este de Asia.
- Se debate la actividad del sistema de fallas de Altyn Tagh, con estimaciones geológicas que varían ampliamente.
- Los modelos anteriores entran en conflicto con su papel en la acomodación de la convergencia indoasiática.
Objetivo del estudio:
- Para cuantificar la tasa de deslizamiento y la contracción a través del sistema de fallas de Altyn Tagh.
- Para comparar mediciones geodésicas con predicciones de modelos geológicos y dinámicos.
- Evaluar la contribución del sistema de fallas de Altyn Tagh a la deformación asiática.
Principales métodos:
- Mediciones geodésicas a través del sistema de fallas de Altyn Tagh (89-91° E).
- Análisis del corte lateral izquierdo y la contracción norte-sur.
- Comparación con las estimaciones existentes de la tasa de deslizamiento geológico y modelos dinámicos.
Principales resultados:
- El corte lateral izquierdo de 9 ± 5 mm yr-1 a través del sistema de fallas de Altyn Tagh.
- Contracción de 3 ± 1 mm yr -1 a través del sistema de fallas de Altyn Tagh.
- La contracción norte-sur en el Tíbet de 9 ± 1 mm yr-1 a 90° E.
Conclusiones:
- Los datos geodésicos sugieren tasas de deslizamiento más bajas para el sistema de fallas Altyn Tagh que algunas estimaciones geológicas.
- La deformación medida apoya las predicciones de los modelos dinámicos de la tectónica asiática.
- El sistema de fallas de Altyn Tagh alberga una porción más pequeña de la convergencia indoasiática de lo que previamente sugerían algunos estudios.
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