相关实验视频
Updated: Jul 11, 2026
08:14
Atom Probe Tomography Analysis of Exsolved Mineral Phases
Published on: October 25, 2019
概括
圣奥古斯丁火山的微型地震群是由潮力量引发的. 活动在潮最大加速后大约一个小时达到顶峰,这表明直接引发压力和海洋潮负载效应.
科学领域:
- 地质物理学 地质物理学
- 火山学 火山学是一门学科.
- 地震学 地震学
背景情况:
- 圣奥古斯丁火山位于阿勒群岛,自1970年以来一直在持续的地震监测下.
- 许多浅处的微型地震群被观察到,特别是在1971年10月的小喷发事件周围.
研究的目的:
- 调查圣奥古斯丁火山微型地震活动和潮力量之间的关系.
- 为了确定潮应力或负载是否影响火山的地震性.
主要方法:
- 自1970年8月以来,持续监测微型地震活动.
- 对每小时的微型地震频率与计算的潮加速度大小的交叉相关性分析.
- 检查地震活动和潮成分之间的相位关系.
主要成果:
- 微型地震活动表现出白天的峰值.
- 确定了两个重要的相位关系:从最大潮加速度延迟1小时和与海洋潮负荷相关的5小时延迟.
- 游泳群活动峰值与特定的潮组成部分相关,表明可能需要潮应力优先导向.
结论:
- 潮压力似乎直接触发圣奥古斯丁火山的微型地震.
- 海洋的潮负荷也影响了微型地震的发生.
- 潮对火山微型地震的有效触发可能取决于潮压力的方向.
相关概念视频
01:06Tidal 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.
01:26Alkali 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...
01:45Destabilization 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...
01:20Microcracking 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...
01:18Deep 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...
01:26Unsoundness 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...