Structure of the electromagnetic radiation signal spectral characteristics during rock failure preparation

In recent years, process of rock failure has become especially urgent with reference to problems of predicting earthquakes, tsunami, and various dynamic rock pressure manifestations in rock masses. One of the methods that are used to predict and control disastrous phenomena is a method based on recording of electromagnetic radiation signals. Experimental investigations of rock samples have revealed some new regularities that precede rock discontinuity and may be further taken as failure criteria for predicting earthquakes and other disastrous phenomena. The authors suggest some of these regularities for consideration. In this paper, it is shown that the acoustic signals, that are distinguished before an earthquake, are in the range from 60 to 75 Hz, and have high-frequency noise recorded on frequency of 30-40 Hz, are the earthquake precursors. In the paper by Deshcherevskii et al. (2003), results of numerous seismograms obtained on the Garmsk proving ground have been analyzed. Basing on this, it has been proposed to ground a new concept of the earthquake prediction criteria on information concerned with the high-frequency fluctuations.