Video Experimental Relacionado
Updated: Jul 13, 2026
06:55
Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
Published on: August 5, 2016
Fundición activa de una raíz de arco continental debajo del sur de Sierra Nevada en California
George Zandt1, Hersh Gilbert, Thomas J Owens
1Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA. zandt@geo.arizona.edu
Nature
|September 3, 2004
Resumen
La densa raíz de las montañas de Sierra Nevada está siendo removida por un goteo del manto, causando el engrosamiento y el hundimiento de la corteza. Este proceso, impulsado por el acoplamiento viscoso, remodela la cordillera de California.
Área de la Ciencia:
- La geofísica es la geofísica.
- La tectónica es la tectónica.
- La geodinámica es la geodinámica.
Sus antecedentes:
- Comprender las interacciones entre la corteza y el manto es crucial para comprender la evolución de las cordilleras montañosas.
- Las montañas del sur de Sierra Nevada proporcionan un laboratorio natural único para estudiar estos procesos.
Objetivo del estudio:
- Para investigar la remoción en curso de la raíz batolítica de Sierra Nevada.
- Para analizar las imágenes sísmicas de las interacciones entre la corteza y el manto y sus efectos en la superficie.
Principales métodos:
- Análisis de datos sísmicos para obtener imágenes de estructuras y procesos subterráneos.
- Interpretación de datos geofísicos para comprender la dinámica de la corteza y el manto.
Principales resultados:
- Los datos sísmicos revelan la eliminación de la densa raíz de la Sierra Nevada iniciada hace 10-3 millones de años a través de la inestabilidad de Rayleigh-Taylor.
- Una zona de corte casi horizontal desprendió la raíz ultramafica; el arrastre viscoso engrosó la corteza del flanco occidental en 7 km.
- Un cono crustal en forma de V se arrastra al goteo del manto, causando la desaparición de Moho en las imágenes sísmicas y provocando el hundimiento de la superficie.
Conclusiones:
- La extracción de la raíz batholitica de Sierra Nevada es un proceso geodinámico activo.
- El acoplamiento viscoso entre la corteza y el manto es el principal impulsor del actual hundimiento de la superficie en la región.
- Las imágenes sísmicas proporcionan información crítica sobre la evolución dinámica de las cadenas montañosas continentales.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:20Region of Convergence of Laplace Tarnsform
The Region of Convergence (ROC) is a fundamental concept in signal processing and system analysis, particularly associated with the Laplace transform. The ROC represents an area in the complex plane where the Laplace transform of a given signal converges, determining the transform's applicability and utility.
Consider a decaying exponential signal that begins at a specific time. When deriving its Laplace transform, the time-domain variable is replaced with a complex variable. This substitution...
Consider a decaying exponential signal that begins at a specific time. When deriving its Laplace transform, the time-domain variable is replaced with a complex variable. This substitution...
01:26Influence of Earth's Curvature and Atmospheric Refraction on Leveling
During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
01:19Magnetic Declination
Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...
01:27Latitudes and Departures
Latitudes and departures are essential concepts in surveying, providing a systematic way to analyze the projections of traverse lines. These projections allow surveyors to interpret a line's north-south and east-west components, which are crucial for precisely calculating areas, bearings, and lengths. Latitude is the north-south projection of a line, calculated as the product of the line's length and the cosine of its bearing. Departure, conversely, is the east-west projection obtained by...
01:24Limits at Infinity
The function that decreases as the input becomes very large provides a clear example of how mathematical functions can behave at extreme values. When the input increases continuously, the output becomes smaller and smaller, getting closer to a particular fixed value. Although the output never actually reaches this value, it moves nearer to it without limit. This behavior is a fundamental concept in understanding how functions behave as the input grows indefinitely. The graphical representation...
01:27Average Value on a Rectangle
A snowfall map can represent how snow depth varies across a region, such as Colorado, over a fixed time period. Since different locations may receive different amounts of snow, the snowfall depth is described by a function of two variables. If f(x,y) represents the snow depth at a point in a rectangular region, then the average snowfall over the entire region is found by comparing the total accumulated snowfall with the area being measured.Total Snowfall over a RegionThe total snowfall over a...