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Time variation of the electromagnetic transfer function of the earth estimated by using wavelet transform
Noriko Suto1, Makoto Harada2, Jun Izutsu3
1Department of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya University, Aichi, Japan . ; Earthquake Research Institute, University of Tokyo, Tokyo, Japan .
Abstract:
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.
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