DOI: 10.1002/grl.50823
论文题名: Two-dimensional simulations of the tsunami dynamo effect using the finite element method
作者: Minami T. ; Toh H.
刊名: Geophysical Research Letters
ISSN: 0094-8611
EISSN: 1944-8342
出版年: 2013
卷: 40, 期: 17 起始页码: 4560
结束页码: 4564
语种: 英语
英文关键词: finite element
; motional induction
; seafloor observation
; time domain
; triangular mesh
; tsunami
Scopus关键词: 2011 tohoku earthquakes
; Geomagnetic main field
; Magnetic components
; Motional induction
; Sea floor
; Time domain
; Triangular meshes
; Two-dimensional simulations
; Electric generators
; Electromagnetic fields
; Finite element method
; Geomagnetism
; Interactive devices
; Tsunamis
; electromagnetic field
; finite element method
; seawater
; simulation
; Tohoku earthquake 2011
; tsunami
; Honshu
; Japan
; Pacific Ocean
; Pacific Ocean (Northwest)
; Tohoku
英文摘要: Conductive seawater moving in the geomagnetic main field generates electromotive force in the ocean. This effect is well known as the "oceanic dynamo effect." Recently, it has been reported that tsunamis are also associated with the oceanic dynamo effect, and tsunami-induced electromagnetic field variations were actually observed on the seafloor. For instance, our research group succeeded in observing tsunami-induced magnetic variations on the seafloor in the northwest Pacific at the time of the 2011 Tohoku earthquake. In this study, we developed a time domain tsunami dynamo simulation code using the finite element method to explain the tsunami-induced electromagnetic variations observed on the seafloor. Our simulations successfully reproduced the observed seafloor magnetic variations as large as 3 nT. It was also revealed that an initial rise in the horizontal magnetic component prior to the tsunami arrival as large as 1 nT was induced by the tsunami. Key Points The first time-domain tsunami dynamo EM simulation was conducted in the world The magnetic signals of the 2011 Tohoku tsunami at NWP were reproduced well A seafloor horizontal magnetic variation preceded the tsunami arrival at NWP ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883455621&doi=10.1002%2fgrl.50823&partnerID=40&md5=0221995754dd83f8cfa737d7d9e3477b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5875
Appears in Collections: 气候减缓与适应
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作者单位: Graduate School of Science, Kyoto University, Kitashirakawaoiwake-cho, Sakyo-ku, Kyoto 6068502, Japan
Recommended Citation:
Minami T.,Toh H.. Two-dimensional simulations of the tsunami dynamo effect using the finite element method[J]. Geophysical Research Letters,2013-01-01,40(17).