Determination of hearth position of a forthcoming strong EQ using gradients and phase velocities of ULF geomagnetic disturbances

摘要: Abstract Behavior of gradient and phase velocity vectors ULF ( F M  > 6) 2003  = 5.8) years. The were determined using the data three high-sensitive three-component magnetic stations situated at a distance ∼5 km from each other (magnetic gradientometer). Two gradientometers installed southeast southwest Tokyo ∼150 km other. It was found that values had anomaly changes 3–4 months before strong EQs. New directions took place in same period – just to forthcoming EQ epicenter. epicenter arouse for vectors. We propose use geomagnetic disturbances as important factors short-term prediction earthquakes.