Articles | Volume 8, issue 4
Nat. Hazards Earth Syst. Sci., 8, 813–817, 2008
https://doi.org/10.5194/nhess-8-813-2008

Special issue: Earthquakes precursors and seismic hazard

Nat. Hazards Earth Syst. Sci., 8, 813–817, 2008
https://doi.org/10.5194/nhess-8-813-2008

  05 Aug 2008

05 Aug 2008

Disturbances in VHF/UHF telemetry links as a possible effect of the 2003 Hokkaido Tokachi-oki earthquake

H. Nagamoto1,2, T. Fukushima3, Y. Ida1,4, Y. Matsudo1,4, and M. Hayakawa1,4 H. Nagamoto et al.
  • 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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