海洋地殻における地震層2aと溶岩層の厚さの相関が矛盾している
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
まとめ
地震層2Aは,若い海洋地殻の溶岩ダイク境界を信頼性のある地図化にはなりません. この地震反射器は,地殻構造の解釈に影響を与える,明確な地質的な接触ではなく,変化の境界を表している可能性が高い.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 海洋地質学 海洋地質学
- 地震学 地震学とは
背景:
- 海洋の地殻は,中洋の山脊のシート状のダイク複合体を覆う溶岩で構成されています.
- 地震性"層2A"は,通常,溶岩と堤防の境界線として解釈されます.
- 以前の研究では,層2Aの厚さの変動から地殻の地質を推論した.
研究 の 目的:
- 地震層2Aと若い海洋地殻の地質構造の関係を調査する.
- 層2Aが溶岩堤防の境界を確実に示すかどうかを判断する.
- 地震層2Aの解釈を再評価する.
主な方法:
- 急速に広がる (ヘス・ディープ) と中途半端に広がる (ブランコ・トランスフォーム・フォール) 地殻からの地震反射データの分析.
- 浅瀬の地震構造を,既知の地質学的な断面と比較する.
- 地震反射器と地質学的単位との相関.
主要な成果:
- 層2Aは,板状の堤防の頂上近くに位置し,地殻が急速に広がっています.
- 層2Aは,中途半端に広がる地殻のシート状の堤防のかなり上にある.
- 浅い地震構造は,溶岩と移行地帯の厚さの違いにもかかわらず,類似性を示しています.
結論:
- 地震層2Aは,若い海洋地殻の溶岩ダイク境界の信頼性の高いマーカーではありません.
- 層2Aは,地殻内の変化境界を表している可能性が高い.
- 層2Aの位置は,溶岩内または堤防の頂上近くで発生し,異なる可能性があります.
関連する概念動画
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


