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Acumulación de cepas anómalas en el área de la montaña de la yuca, Nevada
1B. Wernicke, M. J. Abolins, R. J. Brady, M. A. House, N. A. Niemi, J. K. Snow, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA. J. L. Davis, R. A. Bennett, P. Elosegui, Harvard-Smithsonian Cen.
Science (New York, N.Y.)
|April 8, 1998
Resumen
La extensión de la corteza cerca de Yucca Mountain, Nevada, medida por las encuestas del Sistema de Posicionamiento Global (GPS), está ocurriendo a tasas significativamente más altas de lo previsto anteriormente. Este hallazgo geológico tiene implicaciones para la comprensión de la actividad tectónica en la región.
Área de la Ciencia:
- Geodesia y tectónica.
- Neotectónica del oeste de los Estados Unidos.
Sus antecedentes:
- Yucca Mountain, Nevada, es un sitio considerado para la eliminación de desechos radiactivos de alto nivel.
- La comprensión de la deformación regional de la corteza es crucial para las evaluaciones geológicas.
Objetivo del estudio:
- Para cuantificar las tasas de deformación de la corteza terrestre cerca de la montaña Yucca utilizando mediciones geodésicas precisas.
- Para comparar las tasas de deformación observadas con las predicciones basadas en la historia tectónica cuaternaria de la zona.
Principales métodos:
- Análisis de los datos del Sistema de Posicionamiento Global (GPS) recopilados entre 1983 y 1997.
- Utilizó encuestas de trilateración en una línea de base de 14 kilómetros cerca del sitio de repositorio propuesto.
- Contabilizó los efectos cosismáticos del terremoto de 1992 en la montaña Little Skull.
Principales resultados:
- Elongamiento de la corteza occidental-noroeste medido a velocidades de 1,7 +/- 0,3 mm/año (50 +/- 9 nstrain/año) a lo largo de 34 km.
- Se determinaron tasas de extensión de la corteza terrestre de 0,7 a 0,9 +/- 0,2 mm/año (50 a 64 +/- 14 nstrain/año) a través de una línea de base de 14 km.
- Las tasas de deformación observadas son al menos un orden de magnitud mayores que las predichas por la historia volcánica y tectónica del Cuaternario.
Conclusiones:
- Los datos geodésicos revelan tasas de extensión de la corteza inesperadamente altas en la región de las montañas Yucca.
- La actividad tectónica actual excede significativamente las estimaciones históricas, lo que requiere una reevaluación de los modelos geológicos regionales.
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