Generation of electromagnetic field due to resonance between ground velocity and ions motion in the Earth's magnetic field

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Based on simultaneous observations of ground velocity and electromagnetic field, we have investigated the seismic dynamo effect, in which temporal variations of electromagnetic field associated with ground velocity are caused by cyclotron motion of ions contained in groundwater under the Earth's magnetic field. Circularly polarized electric field, detection of electric field earlier than arrival of seismic waves, and peak frequencies of the transfer function between ground velocity(input) and electric field(output) at cyclotron frequencies for ions in groundwater strongly support the seismic dynamo effect.