The observation of ultra-low frequency emissions at Nakatsugawa, Japan, in possible association with the Sumatra, Indonesia, earthquake

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The observation of direct current (DC)/ultra-low frequency (ULF) electromagnetic emissions at Nakatsugawa, Gifu, Japan, has indicated that ULF emissions in the frequency below 0.1 Hz took place about 3-10 days before the disastrous Sumatra, Indonesia, earthquake. The most important support to this is based on the goniometric direction finding for those ULF emissions during the period of 17-23 December, which indicates their azimuth angle being very close to the epicentre of the earthquake. So, these ULF emissions between 17-23 December are likely to be associated with the earthquake.

Document Type: Research Article


Affiliations: 1: Department of Electronics Engineering, Chubu University, Kasugai Aichi 487-8501, Japan 2: Department of Electronic Engineering, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan

Publication date: July 1, 2007

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