The work is devoted to the study of the spectral characteristics of acoustic emission sources (AE) in rocks. The analysis of data from previously conducted experiments on sandstone and granite samples was carried out in order to analyze acoustic signals arising from mechanical stresses and determine their compliance with seismic processes. The paper describes the calibration of the system, analyzes the consideration of wave attenuation and geometric factors. The main task of the study was to determine the corner frequency for estimating the size of the radiator cracks. During the analysis, it was found that for 99% of the events, the corner frequencies were not detected in the range of 100-1250 kHz. The remaining 1% of events produced corner frequencies of the order of 1080 kHz for sandstone and 975 kHz for granite, which corresponds to maximum crack sizes of 0.5 mm and 1 mm, respectively. The results demonstrate the need for further research and adjustments of techniques to improve measurement accuracy and understand the physical nature of spectral characteristics.
91.30.Cd Body wave propagation
91.30.Px Earthquakes
43.20.Fn Scattering of acoustic waves
$^1$Department of Physics of the Earth, Faculty of Physics, M.V.Lomonosov Moscow State University
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