Structural rearrangement of seismic energy multifractal distributions before strong earthquakes

The spatial distributions of seismic energy (seismic energy fields) in the focal zones of two strong earthquakes - the earthquake of Point MacKenzie, Alaska (𝑀 = 7.1) and the October 30, 2020 Aegean Sea Earthquake (𝑀 ≈ 7) - have been investigated by the multifractal analysis methods. It is shown that the spectra of singularity of the seismic energy fields had undergone the significant widening and changing asymmetry before the main shocks of this events. The structural rearrangements of seismic energy fields may be explained by the increase of energetic fluctuations under the seismogenerating system transitions to strong nonequilibrium state. The effect of seismic energy fields 𝑓(𝑎)-spectra widening before strong earthquakes may be used in the problems of seismogenerating media current state monitoring.