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- Title
Disturbances in VHF/UHF telemetry links as a possible effect of the 2003 Hokkaido Tokachi-oki earthquake.
- Authors
Nagamoto, H.; Fukushima, T.; Ida, Y.; Matsudo, Y.; Hayakawa, M.
- 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.
- Subjects
JAPAN; EARTHQUAKES; NATURAL disasters; SEISMOLOGY; SHORTWAVE radio; EARTHQUAKE hazard analysis
- Publication
Natural Hazards & Earth System Sciences, 2008, Vol 8, Issue 4, p813
- ISSN
1561-8633
- Publication type
Article
- DOI
10.5194/nhess-8-813-2008