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Earthquake effects along paths of VLF radio noise and impulsive signals as observed at Yakutsk

Abstract

An analysis of amplitude variations in the noise and storm-induced impulsive VLF electromagnetic signals recorded at Yakutsk along paths above earthquakes is reported. It is shown that amplitude characteristics of storm-induced VLF signals can usefully supplement signals of radio stations as used in the radio monitoring of regions above earthquakes. The effect on these signals due to earthquakes of magnitude greater than 5 is observed as an amplitude increase within the three days following an earthquake. The pre-seismic variations in the storm-induced signal amplitude which can be regarded as precursors are generally observed as increased amplitudes (within 10 days before the earthquake) with a subsequent minimum.

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Original Russian Text © V.A. Mullayarov, V.I. Kozlov, A.V. Amburskii, 2007, published in Vulkanologiya i Seismologiya, 2007, No. 4, pp. 69–78.

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Mullayarov, V.A., Kozlov, V.I. & Amburskii, A.V. Earthquake effects along paths of VLF radio noise and impulsive signals as observed at Yakutsk. J. Volcanolog. Seismol. 1, 274–282 (2007). https://doi.org/10.1134/S0742046307040069

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  • DOI: https://doi.org/10.1134/S0742046307040069

Keywords

  • Earthquake Effect
  • Earthquake Epicenter
  • Fresnel Zone
  • Earthquake Precursor
  • Loop Antenna