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www.nat-hazards-earth-syst-sci.net/8/813/2008/
doi:10.5194/nhess-8-813-2008
© Author(s) 2008. This work is distributed
under the Creative Commons Attribution 3.0 License.
Disturbances in VHF/UHF telemetry links as a possible effect of the 2003 Hokkaido Tokachi-oki earthquake
1Research Station on Seismo Electromagnetics, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu Tokyo 182-8585, Japan
2Department of Information and Communication Engineering, The University of Electro-Communications, Chofu Tokyo, Japan
3Matsudo Municipal Matsudo High School, 2-7-5 Kamishiki, Matsudo, Chiba, Japan
4Department of Electronic Engineering, The University of Electro-Communications, Chofu Tokyo, Japan
Abstract. The data on radio telemetry links (for water information) at VHF/UHF in Hokkaido are used to investigate the rate of disturbances on radio links (or connection failure) and its association with a huge earthquake, Tokachi-oki earthquake on 26 September 2003. Especially, the telemetry links at the Tokachi region closest to the earthquake epicenter, showed a significant increase in disturbances on radio links two weeks to a few days before the earthquake on the basis of analysis during a long interval from 1 June 2002 to 3 November 2007 (over 5 years). We suggest that these severe disturbances in VHF/UHF telemetry links are attributed to the generation of seismogenic VHF/UHF radio noises (emissions). Based on this idea, we have estimated that the intensity of these seismogenic emissions is on the order of 10–19 dB μV/m. Finally, the present result was compared with other physical parameters already obtained for this earthquake.
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Citation: Nagamoto, H., Fukushima, T., Ida, Y., Matsudo, Y., and Hayakawa, M.: Disturbances in VHF/UHF telemetry links as a possible effect of the 2003 Hokkaido Tokachi-oki earthquake, Nat. Hazards Earth Syst. Sci., 8, 813-817, doi:10.5194/nhess-8-813-2008, 2008. Bibtex EndNote Reference Manager XML
