Video Experimental Relacionado
Updated: May 10, 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
Evidencia sísmica de una deformación profunda generalizada de la corteza terrestre del oeste de los Estados Unidos
M P Moschetti1, M H Ritzwoller, F Lin
1Center for Imaging the Earth's Interior, Department of Physics, University of Colorado at Boulder, Campus Box 390, Boulder, Colorado 80309, USA. mmoschetti@usgs.gov
Nature
|April 9, 2010
Resumen
La anisotropía de la velocidad de las ondas sísmicas en la corteza terrestre revela una deformación generalizada. Este estudio vincula la anisotropía radial de la corteza profunda en el oeste de los Estados Unidos con los procesos tectónicos extensivos del Cenozoico.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- La tectónica es la tectónica.
Sus antecedentes:
- Las velocidades de las ondas sísmicas en los materiales de la Tierra son a menudo anisotrópicas.
- La anisotropía del manto superior está vinculada a la orientación olivina de la deformación y el flujo.
- Las observaciones de la anisotropía radial de la corteza son limitadas, lo que dificulta la comprensión de la deformación de la corteza.
Objetivo del estudio:
- Investigar la anisotropía radial de la corteza a gran escala.
- Comprender la deformación de la corteza terrestre y los patrones de flujo.
- Enlace anisotropía a los procesos tectónicos en el oeste de los Estados Unidos.
Principales métodos:
- Tomografía de ruido ambiental en el oeste de los Estados Unidos.
- Análisis de las variaciones de la velocidad de las ondas sísmicas.
- Correlación de la anisotropía con las provincias geológicas.
Principales resultados:
- Se ha detectado una fuerte anisotropía radial profunda (medio a inferior) de la corteza.
- La anisotropía está confinada a las provincias geológicas extensionales del Cenozoico.
- La coincidencia sugiere la orientación mineral de la deformación extensional.
Conclusiones:
- La anisotropía radial profunda de la corteza en el oeste de los Estados Unidos está vinculada a la extensión del Cenozoico.
- La deformación extensional probablemente causó la orientación preferida por la celosía de los minerales de la corteza.
- Apoya una tensión generalizada y uniforme en la corteza profunda durante la extensión y el adelgazamiento.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:15Strain and Elastic Modulus
The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
01:11Deformation of Member under Multiple Loadings
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
01:12Temperature Dependent Deformation
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
01:15Deformation of a Beam under Transverse Loading
Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
The insights from the bending moment diagram extend to...
The insights from the bending moment diagram extend to...
01:22Elastic Strain Energy for Normal Stresses
Strain energy quantifies the energy stored within a material due to deformation under loading conditions, a fundamental concept in materials science and engineering. The strain energy can be modeled when a material is subjected to axial loading with uniformly distributed stress. In this scenario, the stress experienced by the material is the internal force divided by the cross-sectional area, and the strain induced is directly proportional to this stress through the modulus of elasticity.
If...
If...
01:20Elastic Strain Energy for Shearing Stresses
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...