在Altyn Tagh断层沿着局部化的石质层切割的断层扫描证据
Wittlinger1, Tapponnier, Poupinet
1G. Wittlinger, G. Herquel, F. Masson, Institut de Physique du Globe de Strasbourg, Centre National de la Recherche Scientifique, Universite Louis Pasteur, 5 rue R. Descartes 67084 Strasbourg, France. P. Tapponnier, Laboratoire de Tectoniq.
概括
地震断层扫描显示,在阿尔廷塔格断层下方有一个深深的低速度区域,这表明了显著的石质层切割. 这可能会导致塔林盆地地进入地幔.
科学领域:
- 地质物理学 地质物理学
- 构造学 构造学 构造学 构造学
- 地震学 地震学
背景情况:
- 阿尔廷塔格断层是西藏高原北部的主要构造特征.
- 了解岩层变形对于西藏高原演变至关重要.
研究的目的:
- 通过地震断层扫描来研究Altyn Tagh断层的地下结构和变形.
- 为了确定断层下方异常的深度和性质.
主要方法:
- 在阿尔廷塔赫断层使用地震断层扫描.
- 分析的重点是P波速度异常.
主要成果:
- 在Altyn Tagh断层下发现了一个显著的低P波速度异常,延伸到140公里的深度.
- 这种异常被解释为表明石质层内的冲击滑动剪切.
结论:
- 阿尔廷塔格断层在石质层中容纳了大量的冲击滑动剪切.
- 滑动分离过程可能导致塔林盆地地的潜入底层地幔.
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相关概念视频
Shearing Stress
Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
Stress: General Loading Conditions
To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes.
Elastic 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...
