在海洋地中,地震层2a和岩层厚度之间的相关性不一致
Gail L Christeson1, Kirk D McIntosh, Jeffrey A Karson
1University of Texas Institute for Geophysics, Jackson School of Geosciences, J.J. Pickle Research Campus, Mail Code R2200, 10100 Burnet Road, Austin, Texas 78758, USA. gail@ig.utexas.edu
Nature
|January 26, 2007
概括
地震层2A并不可靠地绘制了年轻海洋地中的岩堤边界. 这种地震反射器可能代表了变化边界,而不是明显的地质接触,影响了对地结构的解释.
科学领域:
- 地质物理学 地质物理学
- 海洋地质学海洋地质学
- 地震学 地震学
背景情况:
- 大洋地由岩组成,覆盖着在中洋山脊上的覆盖层堤复合体.
- 地震"二A层"通常被解释为岩和堤之间的边界.
- 之前的研究从2A层厚度变化中推断出地地质.
研究的目的:
- 研究2A地震层与年轻海洋地的地质结构之间的关系.
- 要确定2A层是否可靠地表示了岩堤边界.
- 重新评估地震层2A的解释.
主要方法:
- 从快速扩散 (赫斯深度) 和中等扩散 (布兰科变形断层) 地的地震反射数据的分析.
- 浅层地震结构与已知的地质部分的比较.
- 地震反射器与地质单位的相关性.
主要成果:
- 层2A位于板状堤的顶部附近,在快速扩散的地上.
- 层2A是在中间扩散的地中,明显地高于板状堤.
- 浅层地震结构显示相似性,尽管岩和过渡区厚度不同.
结论:
- 地震层2A不是一个可靠的标记者,岩堤边界在年轻的海洋地.
- 层2A可能代表地内的变化边界.
- 层2A的位置可能有所不同,发生在岩或堤顶部附近.
相关概念视频
Viscosity
5.6K
When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...
The SI unit of viscosity is...
5.6K
Resistivity
5.1K
When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
5.1K
Magnetic Susceptibility and Permeability
2.9K
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
2.9K
Theories of Dissolution: Diffusion Layer Model
2.1K
Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
2.1K
Influence of Earth's Curvature and Atmospheric Refraction on Leveling
1.3K
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.
1.3K
Boundary Layer Characteristics
945
When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
945


