岛屿上观测到的海啸产生的电磁变化特性。

IF 4.3 3区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences Pub Date : 2024-12-23 Epub Date: 2024-12-02 DOI:10.1098/rsta.2024.0084
Takuto Minami
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引用次数: 0

摘要

导电性海水在环境磁场中运动,会产生电磁变化。海啸是造成这一现象的重要因素,在海底和沿海观测站引起可观察到的电和磁波动。虽然对开阔海洋中这些现象的了解很充分,但对在岛屿上观察这些现象的了解仍然有限。本文试图通过使用数值实验来提高我们对在岛屿上观测到的海啸产生的电磁(TGEM)变化的理解。利用涉及锥形岛屿的模拟,我们确定了关于海啸高度标准化的电磁强度的三个关键观点:(i)岛屿周围海洋深度的增加放大了海啸电磁信号,特别是在短于20分钟的时间内;(ii)当岛屿半径小于6公里时,岛上的磁场强度与没有岛屿时在海底观测到的磁场强度大致相当;(三)岛上的电场强度明显超过海底观测到的电场强度,特别是岛屿半径较小时([公式:见文本]6公里)。此外,我们还证实,在岛屿海岸附近使用岛屿半径与海啸波长之比有助于推导这一现象的经验函数。这篇文章是主题“地球和行星海洋的磁测遥感”的一部分。
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Properties of tsunami-generated electromagnetic variation observed on islands.

Electrically conductive seawater, moving in an ambient magnetic field, generates electromagnetic (EM) variations. Tsunamis are significant contributors to this phenomenon, inducing observable electric and magnetic fluctuations at seafloor and coastal observatories. While understanding of these occurrences in open oceans is robust, knowledge regarding their observation on islands remains limited. This article seeks, through the use of numerical experimentation, to enhance our understanding of tsunami-generated EM (TGEM) variations observed on islands. Utilizing simulations involving conical islands, we identify three key insights regarding EM intensity normalized by the height of incident tsunamis: (i) increased ocean depth surrounding the island amplifies tsunami EM signals, particularly for periods shorter than 20 min; (ii) magnetic field strength at the island is approximately comparable to that observed at the seafloor in the absence of the island when the island radius is smaller than 6 km; and (iii) electric field intensity at the island notably surpasses that observed at the seafloor, especially with smaller island radii ([Formula: see text] 6 km). Additionally, we establish that employing the ratio of island radius to tsunami wavelength near the island coast facilitates the derivation of empirical functions for this phenomenon.This article is part of the theme issue 'Magnetometric remote sensing of Earth and planetary oceans'.

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来源期刊
CiteScore
9.30
自引率
2.00%
发文量
367
审稿时长
3 months
期刊介绍: Continuing its long history of influential scientific publishing, Philosophical Transactions A publishes high-quality theme issues on topics of current importance and general interest within the physical, mathematical and engineering sciences, guest-edited by leading authorities and comprising new research, reviews and opinions from prominent researchers.
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