Stochastic relation between anomalous propagation in the line-of-sight VHF radio band and occurrences of earthquakes
This paper was intended to find out any relation between anomalous line-of-sight propagation on the very high frequency (VHF) band and occurrences of earthquakes near the VHF propagation paths. The television and FM radio broadcasting waves on the VHF band were monitored continuously over the long t...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2014-08-01
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| Series: | Natural Hazards and Earth System Sciences |
| Online Access: | http://www.nat-hazards-earth-syst-sci.net/14/2119/2014/nhess-14-2119-2014.pdf |
| Summary: | This paper was intended to find out any relation between anomalous
line-of-sight propagation on the very high frequency (VHF) band and occurrences of earthquakes
near the VHF propagation paths. The television and FM radio broadcasting
waves on the VHF band were monitored continuously over the long term. For
that purpose, a multidirectional VHF band monitoring system was established
and utilized. Anomalous line-of-sight propagation on the VHF band was
distinguished from the monitored wave by using a statistical analysis. After
the stochastic consideration, it was found out that earthquakes associated
with anomalous propagation were characterized by magnitude of earthquakes
<i>M</i> ≥ 4.5, and distances from epicenters <i>L</i> ≤ 75 km. The anomalous
propagation was monitored on the VHF band a few days before the associated
earthquakes occurred. Moreover, the anomaly appeared on multidirectional
propagation paths simultaneously. The anomaly on the line-of-sight
propagation indicates the possibility of narrowly focusing the area of the epicenter
of earthquake. |
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| ISSN: | 1561-8633 1684-9981 |