Relationship of high-frequency geoacoustic emission and electric field in the atmosphere in seismotectonic process

Joint Anomalies of High-Frequency Geoacoustic Emission and Atmospheric Electric Field by the Ground–Atmosphere Boundary in a Seismically Active Region (Kamchatka)

“…In the authors' opinion [18], the most probable cause of the relation between the electric field and geoacoustic emission in the tectonic component is the near-surface rocks deformation intensification in the region of measurement point. To verify this fact, simultaneous measurements of ground surface deformation are required.…”

“…In the author's opinion [18], the relation between P s and V , represented in Figure 6d-f contains two components, they are: a background component determined by weak effect of uncounted meteorological and other factors on geoacoustic emission and atmospheric electric field and a tectonic nature component. The latter is generated by geoacoustic emission and electric field anomalies different in sign which occur during intensification of near-surface rocks deformation in the region of measurement point.…”

The reason for synchronous disturbances in the atmospheric electric field and high-frequency geoacoustic emission during the seismotectonic process

“…In the Kamchatka experiments, the subsurface rocks in the measurement points represent low strength fractured-porous sedimentary rocks [2][3][4][5]. The increase in the velocity of their extension leads to greater opening of the pores and an extension of frac tures that is accompanied by intensified release of radon and thoron [15], an increase in their contents in the subsurface ground layer, and their significant emis sion into the atmosphere.…”

“…This link is manifested in a baylike decrease in the gradient of potential V' of the electric field (up to the change of the sign) under a sharp and significant increase in the acoustic pressure P S in the kHz frequency range. Such disturbances of V ' and P S were registered in seismically calm periods and during the final stage prior to the earthquake, which indicates their seismotectonic origin [2,3]. The disturbances of the high frequency geoacoustic emis sion prior to the earthquakes are related to active deformation of the subsurface sedimentary rocks at the measurement point [4].…”