如何以及为什么小的火山海洋岛屿崩并垂直上下移动
Fernando O Marques1, Luísa P Ribeiro2, Christian Hübscher3
1EMEPC - Task Group for the Extension of the Continental Shelf, Paço de Arcos, Portugal. fomarques@gmail.com.
Scientific reports
|January 30, 2025
概括
小火山岛屿可能会崩,导致复杂的垂直运动,如升起和沉降. 这种情况发生在火山建筑及其软弱,富含沉积物的基板不稳定时,就像在圣玛丽亚岛上看到的那样.
科学领域:
- 地质地质地质地质地质地
- 火山学 火山学是一门学科.
- 地质物理学 地质物理学
背景情况:
- 火山岛屿质量影响大规模的崩和垂直运动,像夏威夷这样的大岛上经历了沉降和滑坡.
- 较小的火山岛屿的垂直运动动态,可能比简单的沉降更复杂,仍然不太了解.
- 圣玛丽亚岛 (阿佐尔群岛) 提供了一个案例研究,用于在较小的火山建筑中检查这些过程.
研究的目的:
- 调查质量在火山岛稳定性和垂直运动动态中的作用.
- 用地质数据分析圣玛丽亚岛的崩历史和垂直运动.
- 评估小火山岛屿的部门崩的机制和触发因素.
主要方法:
- 从圣玛丽亚岛获得和分析新的陆地和海洋地质物理数据.
- 解释海底和空中岩的垂直分布,以推断地质历史.
- 数字建模用于评估潜在的崩机制和不稳定因素.
主要成果:
- 圣玛丽亚岛经历了多个部门崩,由地质物理数据证明.
- 推断出一个复杂的垂直运动历史 (海山-岛屿-海山-岛屿),表明交替沉降和升起.
- 岛屿的演变与火山构造 (加载引起的沉降) 和部门崩 (卸载引起的升起) 有关.
- 较弱的基板,可能是海洋沉积物,被确定为不稳定的关键因素.
- 靠近东阿佐尔斯断层可能引发了侧翼崩.
结论:
- 小火山岛屿可能容易受到部门崩的影响,严重影响其垂直运动.
- 当火山建筑和其底层基板都很弱时,不稳定性就会出现.
- 这些发现表明,类似的过程可能会影响位于海洋沉积物上的其他火山海洋岛屿.
相关概念视频
Tidal Forces
2.5K
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...
2.5K
Microtubule Instability
5.0K
Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
5.0K
Types of Damping
6.4K
If the amount of damping in a system is gradually increased, the period and frequency start to become affected because damping opposes, and hence slows, the back and forth motion (the net force is smaller in both directions). If there is a very large amount of damping, the system does not even oscillate; instead, it slowly moves toward equilibrium. In brief, an overdamped system moves slowly towards equilibrium, whereas an underdamped system moves quickly to equilibrium but will oscillate about...
6.4K
Damped Oscillations
5.6K
In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
Although friction and other non-conservative...
5.6K
Destabilization of Microtubules
2.6K
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...
2.6K
Factors Affecting Creep
112
In normal-weight aggregate concrete, the hardened cement paste is the primary contributor to creep, whereas the aggregates, being stiffer than the cement paste, are more resilient to stress-induced deformation. The stiffness of the aggregates is defined by their modulus of elasticity, and the more voluminous they are in the concrete, the less it will creep.
Further, the water/cement ratio is critical, as a lower ratio increases concrete strength, thus reducing creep. The strength of the...
Further, the water/cement ratio is critical, as a lower ratio increases concrete strength, thus reducing creep. The strength of the...
112


