The observation of ULF emissions at Nakatsugawa in possible association with the 2004 Mid Niigata Prefecture earthquake

Abstract

The observation of ULF/ELF electromagnetic emissions at Nakatsugawa, Gifu, has indicated that ULF emissions in the frequency below 0.1 Hz take place about two-three weeks before the 2004 Mid Niigata Prefecture earthquakes. The most important suppot to this based on the goniometric direction finding for those ULF emissions in the period of October 2-6, which indicates their azimuth being very close to the epicenters of the earthquake. So, these ULF emissions on October 2-6 are likely to be associated with the 2004 Mid Niigata Prefecture earthquake. Copyright © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB.