DOI: 10.1002/2015GL063055
论文题名: Properties of electromagnetic fields generated by tsunami first arrivals: Classification based on the ocean depth
作者: Minami T. ; Toh H. ; Tyler R.H.
刊名: Geophysical Research Letters
ISSN: 0094-8828
EISSN: 1944-8559
出版年: 2015
卷: 42, 期: 7 起始页码: 2171
结束页码: 2178
语种: 英语
英文关键词: electromagnetic induction
; ocean depth
; seafloor observation
; tsunami
Scopus关键词: Electromagnetic fields
; Electromagnetic induction
; Geomagnetism
; Magnetic fields
; Oceanography
; Surface waters
; First arrival
; Geomagnetic fields
; Magnetic components
; Magnetic variation
; Maximum amplitude
; Ocean depth
; Sea floor
; Sea surface elevation
; Tsunamis
; classification
; climate prediction
; electromagnetic field
; sea surface height
; tsunami
; water depth
英文摘要: Tsunami flow coupled with the geomagnetic field generates electric currents and associated magnetic fields. Although electromagnetic (EM) tsunami signals can be used for analysis and even forecasting tsunami propagation, the dynamically self-consistent effect of shoaling water depth on the fluid + electrodynamics has not been adequately clarified. In this study, we classify tsunami EM phenomena into three cases based on the ocean depth and find that the deeper ocean results in stronger self-induction due to the increase in both tsunami phase velocity and ocean conductance. In this deep-ocean case, the phase lead of the vertical magnetic variation relative to the sea surface elevation is smaller, while an initial rise in the horizontal magnetic component becomes observable prior to tsunami arrival. Furthermore, we confirm that the enhancement of tsunami height in shallower oceans shifts the ocean depth supplying maximum amplitudes of tsunami magnetic fields from approximately 2.0 km to 1.5 km. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84928698887&doi=10.1002%2f2015GL063055&partnerID=40&md5=dffcc458d7592fea919ec2bd024d0233
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8444
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Graduate School of Science, Kyoto University, Kyoto, Japan
Recommended Citation:
Minami T.,Toh H.,Tyler R.H.. Properties of electromagnetic fields generated by tsunami first arrivals: Classification based on the ocean depth[J]. Geophysical Research Letters,2015-01-01,42(7).