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Abstract

Summary

We study the atmospheric variations in the intensity of broadband wireless signal propagation correlated with preearthquake processes. We maintain ground observations in the VHF range of 1.8 -3.5GHz in Bulgaria, Southeast Europe, close to Northern Greece, and FYR since 2012. We are recently working with three EMC antennas with a receiving range of 10MHz - 6GHz and real-time processing RF Spectrum Analyzer. Our observations revealed phenomena associated with a natural enhancement of the intensity of the signals days/hours before the seismic events, even far from the observation region. We are presenting results related to several earthquakes in the Balkan area: M5.6 of May 22, 2012, in Bulgaria, M5.1 from August 12, 2018, in Albania; M4.1 from August 2, 2018, in Southern Bulgaria; and M5.5 of October 28, 2018, in Romania. The VHF antennas have registered all earthquake events in Bulgaria at a distance of between 20 and 400km. The source for the intensity intensification could be the electrical and electrochemical processes in the atmosphere presented into the regions surrounding the transmitter- EMC antennas. Some changes in the atmospheric boundary layer (ABL), triggered by an intensification of radon and other gases release, could lead to a change in lower atmosphere conductivity.

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/content/papers/10.3997/2214-4609.202149BGS66
2021-10-10
2024-04-29

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References

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Modulation in VHF Wireless Signals Associated With Preearthquake Processes. Case Studies for the Balkans
Conference Proceedings 2021, 1 (2021); https://doi.org/10.3997/2214-4609.202149BGS66
/content/papers/10.3997/2214-4609.202149BGS66
/content/papers/10.3997/2214-4609.202149BGS66
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