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The depression (reduction in amplitude) of ULF (ultra-low-frequency) magnetic field variations observed on the Earth's surface is found for the recent huge Japan earthquake (EQ) (magnitude(M) ∼ 9.0) on March 11, 2011 which is a typical oceanic EQ of the plate type. In order to confirm the presence of such a ULF depression, we have also studied the additional two huge oceanic EQs in the Kurile islands...
In order to verify and clarify the ULF seismo-magnetic phenomena, a statistical investigation of the relation between magnetic anomalies and local seismicity has been performed. Geomagnetic data observed during 2001∼2010 at the Kakioka observation (JMA), Izu and Boso stations have been analyzed. Energy of ULF geomagnetic signals at the frequency around 0.01Hz has been investigated by wavelet transform...
This paper summarizes the current understanding of geomagnetic storms and their impacts on the power grid. Accomplishments over the past 23 years are reviewed, and the remaining aspects to be resolved are mentioned. The second part of the paper describes the basic mitigation concepts that can be used to minimize or eliminate these impacts through operational and/or protective measures.
In ELF range, we finally detected electromagnetic (EM) pluses directly excited by earthquakes in a deep borehole. By simultaneous capturing of waveforms of magnetic component of the EM pulses and of seismic waves measured at the EM observation site, we have confirmed that seismic P-wave readily excited EM waves. The result suggests that EM waves were very sensitive to the vibrations of seismic waves...
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