オリエンタル盆地の重力場は,重力回復と内部研究室ミッションから
Maria T Zuber1, David E Smith2, Gregory A Neumann3
1Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA. zuber@mit.edu.
まとめ
オリエンタル盆地
科学分野:
- 月の地質学
- 惑星科学
- 衝突クレーター
背景:
- オリエンテル盆は月面上で最も若く,最もよく保存されている大きな衝突構造です.
- その形成を理解することで 惑星の進化の洞察が得られます
研究 の 目的:
- 高解像度データを用いて Orientale盆地の重力場を調査する.
- 移動した地殻物質の量を測定し, 断続的なクレーターの大きさを推測する.
- 流域のリングと関連した断層の構造特性を分析する.
主な方法:
- GRAIL (グラビティ・リカバリー・アンド・インテリア・ラボラトリー) のデータを使用した.
- 3~5kmの水平解像度で重力場データを分析した.
- 異なるリング構造をマッピングし,地下断層を推論した.
主要な成果:
- 少なくとも (3.4 ± 0.2) × 10^6 km^3の地殻物質が発掘され再分配された.
- クレーターの直径は320~460kmと推論した.
- 3つのリングが解け 外輪に繋がったマントルの断層が特定された
結論:
- オリエンテルの地殻構造は,多層盆地形成モデルに重大な制約を与える.
- GRAILのデータは 月面衝突盆地の 詳細な構造を明らかにしています
- この研究は,月面の大規模な衝突の過程についての理解を深めています.
関連する概念動画
Geoid and Ellipsoid
947
The Earth's shape is best described as an ellipsoid, a slightly flattened sphere created by rotating an ellipse around its minor axis. This flattening results in the polar axis being about 21 kilometers shorter than the equatorial axis. In contrast, the geoid represents the Earth's gravitational shape and aligns with the mean sea level (MSL). The geoid is an irregular equipotential surface where gravity is perpendicular at every point. Variations in Earth's mass distribution cause geoid...
947
Gravity between Spherical Bodies
9.6K
Newton's law of gravitation describes the gravitational force between any two point masses. However, for extended spherical objects like the Earth, the Moon, and other planets, the law holds with an assumption that masses of spherical objects are concentrated at their respective centers.
This assumption can be proved easily by showing that the expression for gravitational potential energy between a hollow sphere of mass (M) and a point mass (m) is the same as it would be for a pair of extended...
This assumption can be proved easily by showing that the expression for gravitational potential energy between a hollow sphere of mass (M) and a point mass (m) is the same as it would be for a pair of extended...
9.6K
Precipitation Gravimetry
15.9K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
15.9K
Gravimetry: Overview
14.8K
Gravimetric analysis is a quantitative method where the analyte is isolated and weighed directly or after conversion into a substance of known composition. Gravimetric analysis can be classified as precipitation, electrogravimetry, volatilization, and particulate gravimetry, based on the method used to isolate the analyte.
In precipitation gravimetry, the analyte is converted into a precipitate and weighed. For example, the silver content in a sample can be estimated by precipitating and...
In precipitation gravimetry, the analyte is converted into a precipitate and weighed. For example, the silver content in a sample can be estimated by precipitating and...
14.8K
Coriolis Force
6.9K
An accelerating particle experiences a force equal to the mass multiplied by the acceleration in an inertial frame of reference. Consider a particle in a non-inertial frame of reference, such as a sliding ball on a rotating table. The acceleration of the ball in this rotating reference frame is different than in the intertial frame, which modifies its equation of motion. The fictitious forces acting additionally on a rotating frame of reference alter Newton's Second Law expression.
6.9K
Influence of Earth's Curvature and Atmospheric Refraction on Leveling
1.1K
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...
1.1K


