掘削洞の観測所によって捕捉された南海峡の浅い緩やかな滑り
Joshua R Edgington1, Demian M Saffer1, Charles A Williams2
1University of Texas Institute for Geophysics, Austin, TX, USA.
まとめ
オフショア・サブデュークション・ゾーンの研究では,スロースリップ・イベント (SSE) が海に向かって移動していることが明らかになっています. 高孔液圧とSSE源地域の低ストレスは,これらの要因を浅いゆっくりとした地震と関連付ける証拠を提供します.
科学分野:
- 地理学
- 構造学
- 地震学
背景:
- 沈殿地でのストレスの蓄積と放出を理解することは,浅い滑りや津波の可能性を評価するために不可欠です.
- これらのプロセスのオフショアパターンは,まだ十分に理解されていません.
研究 の 目的:
- ナンカイ潜水地域におけるスロースリップイベント (SSE) の詳細なスリップタイム履歴を分析する.
- 毛穴液圧,ストレス,そして浅いSSEとの関係を調査する.
主な方法:
- 3つのオフショア掘削観測所からの形成孔圧記録の分析.
- スリップ開始,移動,および関連する地震現象を追跡します.
主要な成果:
- 2つのSSEが記録され,溝から約30km陸に向かって始まり,1〜2km/日で海に向かって移動した.
- 溝から数キロ離れたところまで滑り込み,おそらく破裂し,震動/非常に低い周波数の地震と一致しました.
- SSE源領域は高孔液圧と低ストレスを示した.
結論:
- 高孔液圧と低ストレスを浅いゆっくりとした地震と関連付ける観察的証拠を提供します.
- SSEはプレート境界の最も浅い部分に広がることが示されています.
- 潜水地のダイナミクスのためのオフショアモニタリングの重要性を強調します.
関連する概念動画
Precipitation Gravimetry
7.6K
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...
7.6K
Atomic Nuclei: Larmor Precession Frequency
1.7K
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
1.7K
Shearing Strain
638
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between...
638
Gravimetry: Overview
6.8K
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...
6.8K
Relative Motion Analysis using Rotating Axes
549
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
549
Gyroscope: Precession
4.6K
Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
4.6K


