Time variation of the electromagnetic transfer function of the earth estimated by using wavelet transform
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概要
- 論文の詳細を見る
In order to accurately estimate the geomagnetic transfer functions in the area of the volcano Mt. Iwate (IWT), we applied the interstation transfer function (ISTF) method to the three-component geomagnetic field data observed at Mt. Iwate station (IWT), using the Kakioka Magnetic Observatory, JMA (KAK) as remote reference station. Instead of the conventional Fourier transform, in which temporary transient noises badly degrade the accuracy of long term properties, continuous wavelet transform has been used. The accuracy of the results was as high as that of robust estimations of transfer functions obtained by the Fourier transform method. This would provide us with possibilities for routinely monitoring the transfer functions, without sophisticated statistical procedures, to detect changes in the underground electrical conductivity structure. (Communicated by Seiya UYEDA, M.J.A.)
- 日本学士院の論文
著者
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Izutsu Jun
Earth Watch Safety Net Research Center Chubu University
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Nagao Toshiyasu
Earthquake Prediction Research Center Tokai University
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Nagao Toshiyasu
Earthquake Prediction Res. Center Tokai Univ.
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SUTO Noriko
Department of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya Uni
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HARADA Makoto
Venture Business Laboratory, Chiba University
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IZUTSU Jun
Institute of Oceanic Research and Developments, Tokai University
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Suto Noriko
Department Of Chemistry Faculty Of Science Niigata University
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井筒 潤
中部大学
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SUTO Noriko
Department of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya University
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NAGAO Toshiyasu
Earthquake Research Institute, University of Tokyo
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