Method to form a geophysical signals catalog basedon geoacoustic emission signals

• DOI

The article is devoted to a new approach to the systematization of geophysical signals. The system approach is described. It includes stages of detection, analysis, object and structural description, classification of pulses. A method based on the adaptive threshold calculation is proposed for pulse detection in geoacoustic emission signals. The threshold value is calculated using the signal standard deviation and automatically recalculated for each considered part of the signal. The authors propose to analyze the detected pulses using sparse approximation methods. The article describes the main idea of the adaptive matching pursuit. This method allows to decompose the pulse into the basis functions of the combined Gauss–Berlage dictionary with minimum spatial and temporal costs and with the required accuracy of the constructed approximations. Obtained sparse representations are described under the objective approach as combination of informative features identified during the analysis, for example, the number of functions in the decomposition, parameters of functions, etc. The authors propose a classification of the geoacoustic emission pulses obtained from the results of real signals analysis. Four classes of geoacoustic pulses are defined. The object description of geoacoustic emission pulses is supplemented by an original structural description based on the relations of pulse local extremums. That makes it possible to significantly reduce the variety of pulse shapes for their further identification. The results obtained during the application of the described system approach to the analysis of geoacoustic signals are summarized in the Geophysical Signals Catalog.

Senkevich Yu.I., Lukovenkova O.O., Solodchuk A.A. Method to form a geophysical signals catalog based on geoacoustic emission signals.Geosystems of Transition Zones, 2018, vol. 2, N 4, p. 409–418. (In Russ.). doi: 10.30730/2541-8912.2018.2.4.409-418