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La deformación actual de la corteza terrestre en China está limitada por las mediciones del sistema de
Q Wang1, P Z Zhang, J T Freymueller
1Institute of Seismology, China Seismological Bureau, Wuhan 430071, China.
Science (New York, N.Y.)
|October 20, 2001
Resumen
Las mediciones del Sistema de Posicionamiento Global (GPS) revelan que el acortamiento de la corteza terrestre en China absorbe más del 90% del movimiento de la placa India-Eurasia. La meseta tibetana es la meseta tibetana.
Área de la Ciencia:
- La geofísica es la geofísica.
- La tectónica es la tectónica.
- La cinemática de las placas
Sus antecedentes:
- La colisión de la India con Eurasia conduce a una deformación significativa de la corteza.
- Comprender la distribución de esta deformación es clave para la tectónica de placas.
- Estudios anteriores han utilizado varios métodos geofísicos para evaluar la tensión regional.
Objetivo del estudio:
- Para cuantificar el particionamiento de la convergencia de placas de la India y Eurasia utilizando datos de GPS.
- Determinar la contribución de la meseta tibetana y sus regiones circundantes a esta convergencia.
- Para investigar el movimiento hacia el este de la meseta del sur del Tíbet y sus mecanismos de acomodación.
Principales métodos:
- Análisis de mediciones de alta precisión del Sistema de Posicionamiento Global (GPS) en toda China.
- Procesamiento de datos geodésicos para obtener las velocidades de la corteza terrestre.
- Modelado cinemático para interpretar patrones de deformación e interacciones de placas.
Principales resultados:
- El acortamiento de la corteza terrestre acomoda la mayor parte de la penetración de la India en Eurasia.
- La meseta tibetana y sus márgenes (Himalaya, Altyn Tagh, Qilian Shan) absorben más del 90% del movimiento relativo de las placas.
- El acortamiento interno de la meseta tibetana representa más de un tercio de la convergencia total.
- La meseta tibetana del sur exhibe un movimiento hacia el este en relación con la India y Eurasia, acomodado por la rotación alrededor de la sintaxis oriental.
- Los bloques de China del Norte y del Sur se mueven coherentemente hacia el este-sureste a 2-8 mm/año y 6-11 mm/año, respectivamente, en relación con la Eurasia estable.
Conclusiones:
- La deformación de la corteza, principalmente el acortamiento, es el mecanismo dominante para acomodar la convergencia de las placas de la India y Eurasia.
- La meseta tibetana juega un papel crucial en la absorción de una parte significativa de esta convergencia a través de la deformación interna y las interacciones fronterizas.
- Se observa un comportamiento cinemático distinto dentro y al este de la meseta tibetana, destacando la compleja tectónica regional.
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