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Imagen del subcontinente indio bajo el Himalaya
Vera Schulte-Pelkum1, Gaspar Monsalve, Anne Sheehan
1Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado 80309-0399, USA. vera.schulte-pelkum@colorado.edu
Nature
|July 1, 2005
Resumen
Los investigadores tomaron imágenes de la placa india debajo del Himalaya, revelando su decolletaje y Moho. La anisotropía sísmica se desarrolla por encima del decollamento, y una región de alta velocidad en la corteza inferior sugiere la formación de eclogita, que afecta a la dinámica de la meseta tibetana.
Área de la Ciencia:
- La geofísica es la geofísica.
- La tectónica es la tectónica.
- Sismología Sismología Sismología.
Sus antecedentes:
- La corteza del subcontinente indio se sumerge bajo el Himalaya y la meseta tibetana.
- Las observaciones superficiales en el Tíbet están modificadas por procesos geológicos del Himalaya.
- La geometría de la placa india dentro del Himalaya sigue siendo poco comprendida.
Objetivo del estudio:
- Para visualizar el decollemento y el Moho debajo del Himalaya.
- Para entender la geometría del proceso de desmontaje de la placa india.
- Para investigar las propiedades de la corteza terrestre y su influencia en la meseta tibetana.
Principales métodos:
- Perfiles de reflexión sísmica para obtener imágenes de estructuras subterráneas.
- Análisis de los datos sísmicos para identificar el desprendimiento y Moho.
- Interpretación de la velocidad sísmica y la anisotropía.
Principales resultados:
- Se obtuvieron imágenes sísmicas directas del desprendimiento y Moho debajo del Himalaya.
- Se observó una fuerte anisotropía sísmica por encima del decollamento, vinculada a procesos de cizallamiento y terremotos.
- Se identificó una región de alta velocidad en la corteza inferior de la India, indicativa de eclogita, al norte del Himalaya.
Conclusiones:
- El estudio proporciona imágenes sin precedentes de la geometría de empuje de la placa india.
- La anisotropía sísmica y la formación de eclogitas son factores clave que influyen en la tectónica del Himalaya y la dinámica de la meseta tibetana.
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