関連する実験動画
Updated: Jul 11, 2026

08:14
Atom Probe Tomography Analysis of Exsolved Mineral Phases
Published on: October 25, 2019
アラスカ州セント・アウグスティヌス火山の微小地震は,地球の潮によって引き起こされた
まとめ
セント・アウグスティヌス火山の微小地震群は,潮力によって引き起こされます. アクティビティのピークは,最大潮加速から約1時間後であり,直接的なストレス誘発と海洋潮負荷効果を示唆している.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 火山学 火山学とは
- 地震学 地震学とは
背景:
- アレウシア諸島に位置するセント・アウグスティヌス火山は,1970年以来,継続的な地震モニタリングを受けています.
- 多くの浅いマイクロ地震群が観測され,特に1971年10月の小規模な噴火イベントの周りに観測されました.
研究 の 目的:
- セント・アウグスティヌス火山の微小地震活動と潮力との関係を調査する.
- 潮のストレスや負荷が火山の地震性に影響するかどうかを判断する.
主な方法:
- 1970年8月以降のマイクロ地震活動の継続的なモニタリング.
- 計算された潮加速の大きさによる小規模地震の頻度に関するクロス相関分析.
- 地震活動と潮の構成要素の相関係を調べる.
主要な成果:
- マイクロ地震活動は,昼間ピークを示した.
- 2つの重要な相関係が特定されました:最大潮加速から1時間の遅延と,海洋潮負荷と相関する5時間の遅延です.
- 群れ活動のピークは,特定の潮の要素と相関しており,潮のストレスの優先的な指向の潜在的な要求を示しています.
結論:
- 潮のストレスがセント・アウグスティヌス火山の微小地震を直接引き起こすようです.
- 海洋の潮負荷は,マイクロ地震の発生にも影響を及ぼします.
- 潮による火山の微小地震の有効な誘発は,潮のストレスの方向性に左右される可能性があります.
関連する概念動画
Tidal Forces
The origin of Earth's ocean tides has been a subject of continuous investigation for over 2000 years. However, the work of Newton is considered to be the beginning of the proper understanding of the phenomenon. Ocean tides are the result of gravitational tidal forces. These same tidal forces are present in any astronomical body; they are responsible for the internal heat that creates the volcanic activity on Io, one of Jupiter's moons, and the breakup of stars that get too close to black holes.
Alkali Aggregate Reaction in Concrete
The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
Destabilization of Microtubules
The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
Microcracking in Concrete
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
Deep Sea Microbial Ecology
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...
Unsoundness of Aggregate due to Volume Change
Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...