Numerical studies of geomagnetically induced electric field on seafloor and near coastal zones incorporated with heterogeneous conductivity distributions

• 資料種別: 記事
• タイトル: Numerical studies of geomagnetically induced electric field on seafloor and near coastal zones incorporated with heterogeneous conductivity distributions
• 著者・編者: Tada-nori Goto
• 出版事項: 日本 : Springer science+business media
• 出版年月日等: 2015-12-02
• 出版年（W3CDTF）: 2015-12-02
• タイトル（掲載誌）: EPS : Earth, Planets and Space
• 巻号年月日等（掲載誌）: 67(193)
• 掲載巻: 67(193)
• ISSN（掲載誌）: 1880-5981
• ISSN-L（掲載誌）: 1343-8832
• 本文の言語コード: eng
• DOI: 10.1186/s40623-015-0356-2; https://doi.org/10.1186/s40623-015-0356-2
• 国立国会図書館永続的識別子: info:ndljp/pid/9772887; https://dl.ndl.go.jp/pid/9772887
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• 受理日（W3CDTF）: 2016-02-03T17:25:14+09:00
• 保存日（W3CDTF）: 2015-12-20
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• 掲載誌（国立国会図書館永続的識別子）: info:ndljp/pid/9227920; https://dl.ndl.go.jp/pid/9227920
• 連携機関・データベース: 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

• 要約等: Abrupt changes of geomagnetic field can make large induced electric field and resultant electric current on the earth, which is called as geomagnetically induced current (GIC). It can yield damages to pipelines, cables, and other architectures. For understanding the phenomena and future risks of GIC, it is necessary to evaluate how the sub-surface electrical conductivity structure is important for the GIC because the heterogeneous conductivity structure in the crust and mantle affects the induced electrical current locally. The hazard prediction based on the homogeneous earth may result in the underestimation. Here, I introduce possible cases of geomagnetically induced electric field (GIE) on seafloor and near coastal areas, based on numerical forward simulations on one-, two-, and three-dimensional (1-D, 2-D, and 3-D) earth’s structure including the sea layer. On the 1-D case, I show the possible amplitude of GIE on the seafloor, far from the coastal area. The second case study comes from 2-D forward simulation, in which the straightly elongated coastal line is assumed, and various sub-surface and sub-seafloor conductivity structures are imposed. The numerical results suggest that the amplitude of GIE on land becomes more than two times larger than that of the homogeneous earth without the sea layer. The width of land zone with larger GIE is about 20 km from the coast. In forward modeling with a simplified 3-D bathymetry, land electric field near the bay area increases with about ten times larger than that of the inland one. The seafloor GIE near the peninsula area also indicates about four times larger value than that of the other area at the same water depth. These phenomena can be explained by the boundary charge along the coastal area. I conclude that 3-D earth’s conductivity structure including the realistic bathymetry and sub-surface and sub-seafloor structures should be essential and focused for the hazard assessment of GIC.
• DOI: 10.1186/s40623-015-0356-2; https://doi.org/10.1186/s40623-015-0356-2
• オンライン閲覧公開範囲: インターネット公開
• 著作権情報: © 2015 Goto.; This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
• 関連情報（URI）: http://hdl.handle.net/2433/208992; http://id.ndl.go.jp/digimeta/9772887; https://dl.ndl.go.jp/pid/9772887; http://link.springer.com/content/pdf/10.1186/s40623-015-0356-2.pdf; http://link.springer.com/article/10.1186/s40623-015-0356-2/fulltext.html; http://link.springer.com/content/pdf/10.1186/s40623-015-0356-2
• 参照: Time Domain Simulation of Geomagnetically Induced Current (GIC) Flowing in 500‐kV Power Grid in Japan Including a Three‐Dimensional Ground Inhomogeneity; https://cir.nii.ac.jp/crid/1360848658223017344
• 参照: The Magnetotelluric Method; https://cir.nii.ac.jp/crid/1360001113986213888; Magnetic and Electric Fields Produced in the Sea During Geomagnetic Disturbances; https://cir.nii.ac.jp/crid/1360011144536025472; Three‐dimensional electromagnetic modeling using finite difference equations: The magnetotelluric example; https://cir.nii.ac.jp/crid/1360011144801589376; GIC observations and studies in the Hydro-Québec power system; https://cir.nii.ac.jp/crid/1360011145652027520; Three‐dimensional inversion of seafloor magnetotelluric data collected in the Philippine Sea and the western margin of the northwest Pacific Ocean; https://cir.nii.ac.jp/crid/1360285704778419200; Geomagnetically Induced Currents as Ground Effects of Space Weather; https://cir.nii.ac.jp/crid/1361699993702223104; Modelling of natural sources of magnetospheric origin in the interpretation of regional induction studies: A review; https://cir.nii.ac.jp/crid/1361699995209882752; A Technique for Improving the Accuracy of Finite Element Solutions for Magnetotelluric Data; https://cir.nii.ac.jp/crid/1361699995242158976; Magnetotelluric responses of three-dimensional bodies in layered earths; https://cir.nii.ac.jp/crid/1362262943978511872; Electric field at the seafloor due to a two-dimensional ionospheric current; https://cir.nii.ac.jp/crid/1362262944322845056; Surface electric fields for North America during historical geomagnetic storms; https://cir.nii.ac.jp/crid/1362544418404435072; The extreme magnetic storm of 1–2 September 1859; https://cir.nii.ac.jp/crid/1362544418880423680; Effects of space weather on high-latitude ground systems; https://cir.nii.ac.jp/crid/1363107370867134208; The magnetotelluric method in the exploration of sedimentary basins; https://cir.nii.ac.jp/crid/1363388843291960832; A review of progress in modelling of induced geoelectric and geomagnetic fields with special regard to induced currents; https://cir.nii.ac.jp/crid/1363670318452100352; Modeling geomagnetically induced currents in Hokkaido, Japan; https://cir.nii.ac.jp/crid/1363670321193915648; Modelling the electric field at the seafloor due to a non-uniform ionospheric current; https://cir.nii.ac.jp/crid/1364233268708021888; Resistivity image of the Philippine Sea Plate around the 1944 Tonankai earthquake zone deduced by Marine and Land MT surveys; https://cir.nii.ac.jp/crid/1390001206512003072; Electrical conductivity imaging of the Philippine Sea upper mantle using seafloor magnetotelluric data; https://cir.nii.ac.jp/crid/1574231876079631744; Estimation of geomagnetically induced currents based on the measurement data of a transformer in a Japanese power network and geoelectric field observations; https://cir.nii.ac.jp/crid/2050588892142875776; Reproducing electric field observations during magnetic storms by means of rigorous 3-D modelling and distortion matrix co-estimation; https://cir.nii.ac.jp/crid/2051433317070238976; The characteristics of geoelectric fields at Kakioka, Kanoya, and Memambetsu inferred from voltage measurements during 2000 to 2011; https://cir.nii.ac.jp/crid/2051996267026425984; Compilation of 3D global conductivity model of the Earth for space weather applications; https://cir.nii.ac.jp/crid/2051996267026456320
• 連携機関・データベース: 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
• 提供元機関・データベース: 学術機関リポジトリデータベース; https://irdb.nii.ac.jp; 雑誌記事索引データベース; https://ndlsearch.ndl.go.jp; Crossref; https://www.crossref.org; CiNii Articles; 科学研究費助成事業データベース; https://kaken.nii.ac.jp/ja
• 書誌ID（NDLBibID）: 9772887; http://id.ndl.go.jp/bib/9772887
• NII論文ID: 120005716318