Variations in thunderstorm VLF emissions propagating over epicenters of earthquakes

Details Variations in thunderstorm VLF emissions propagating over epicenters of earthquakes Variations in thunderstorm VLF emissions propagating over epicenters of earthquakes

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jastp..69.1513m&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 69, Issue 13, p. 1513-1523.

Physics

1

Scientific paper

In this study, the variations of average amplitude of the very-low-frequency (VLF) signal thunderstorm origin propagating over areas of strong (magnitude >5) earthquakes are considered. Despite the non-stationary state of thunderstorms, a decrease in the amplitude of its VLF signals was usually detected 3 6 days before an earthquake, with subsequent recovery on the day of the event. The effect is similar to the attenuation of the signal amplitude of low-frequency radio stations that is observed for several days before the occurrence of an earthquake. These influences of earthquakes on thunderstorm VLF signals are recorded along different paths (different azimuths and different distances to the earthquake epicenter). The probability that an earthquake of strong magnitude will induce changes in the thunderstorm VLF signal is 60 70%.

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