Skip to content


Open Access

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

Earth, Planets and Space201457:BF03351889

Received: 8 February 2005

Accepted: 28 August 2005

Published: 20 June 2014


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 support to this is 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.

Key words

Seismogenic ULF emissions2004 Mid Niigata Prefecture earthquakegoniometric direction finding