TY JOUR TI On the mechanism of intensity variations of geoacoustic emission caused under the action of audio-frequency electromagnetic field KW Geoacoustic emission KW electromagnetic impact KW electrical double layers KW fluid KW borehole KW earthquake KW physical mechanism JO Russian Journal of Earth Sciences AU Gavrilov, V.A. PY 2014 IS 14 PB Geophysical Center of the Russian Academy of Sciences