30 Jan 2021. Cumiana Update; "Predictive Capability Of VLF/LF Emissions"; Part 5, Conclusions
6Prediction Capabilities of VLF/LF Emission as the Main Precursor of Earthquake
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M.K.Kachakhidze1 and N.K.Kachakhidze1
[1] {Saint Andrew the First-Called Georgian University}
EM emission that is considered as earthquake indicator is namely the main precursor, which “brings” for large inland (M≥5) earthquake prediction the rich information about the stages of earthquake preparation process going on in the focus and in case of its permanent monitoring enables us to predict incoming earthquake by definite precision:
1. Appearance of intermittent electromagnetic emission spectrum in seismically active region, mainly in MHz range, refers to the fact that the process of large earthquake preparation has been started in the region; at this time, it is possible to fix the so-called “regional foreshocks” of relatively small magnitude and it is not excluded that this process will start some dozen months before the earthquake;
2. Due to the formation of significant size faults in focus, few days (approximately a fortnight) before earthquake, uninterrupted electromagnetic emission appears in MHz, kHz and ULF spectral range; In the spectrum initially MHz and ULF range emission should prevail, but periodically we should expect kHz range electromagnetic emission too;
3. On the next stage, in electromagnetic emission spectrum mainly kHz range frequencies dominate, which denotes that kilometer order main fault is in the process of formation in the focus already;
Shortly before the occurrence of earthquake, electromagnetic emission spectrum is only of kHz order, and it decreases swiftly;
In case of the devastating earthquakes (M≥8.3) the main value of electromagnetic emission falls even to Hz order; 9