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ホーム > 刊行物 > 地磁気観測所テクニカルレポート 第14巻 第02号 > 地磁気観測所テクニカルレポート 第14巻 第02号 >Numerical modeling of spatial profiles of geomagnetically induced electric field intensity in and around Japan

地磁気観測所テクニカルレポート 第14巻 第02号, p.35, March, 2018


Numerical modeling of spatial profiles of geomagnetically induced electric field intensity in and around Japan


Shigeru FUJITA, Ikuko FUJII, Arata ENDO & Hiroki TOMINAGA


Abstract

 The nationwide intensity map of geomagnetically induced electric fields (GIEs) in Japan
  is presented by using a numerical modeling method. We estimate near-surface resistivity
  distributions from bathymetry and sediment thickness data. GIE intensity distributions are
  computed for external geomagnetic variations at periods of 200, 800 and 3,600 sec. The GIE
  intensity is normalized with respect to the magnetic variation of 100 nT at Kakioka Magnetic
  Observatory. The GIE appears significantly enhanced mainly in coastal areas. In addition,
  the enhancement penetrates a few tens of kilometers inland. From the present calculations,
  we identify the areas where the GIEs can be largely enhanced, these are (1) the northeast
  coast along the Sea of Ohotsuku, in Hokkaido; (2) the west coast along the Sea of Japan, in
  southern Hokkaido and Aomori Prefecture (Matsumae-Tsugaru area); (3) the northwest coast
  along the Sea of Japan, in Niigata Prefecture and Toyama Bay; (4) the southwest coast of the
  Pacific Ocean; and (5) the east coast of the Korean Peninsula. Further we need to know the
  geomagnetically induced currents (GICs) in Japan. However, we cannot calculate the GICs in
  Japan because the power line parameters are not disclosed by policy of Japanese power line
  companies.



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