Method for identification of geopulses to include into the Geophysical Signal Catalogue

Abstract

A new system approach to the identification and systematization of geophysical pulses is described. It includes stages of detection, analysis, object and structural description, pulse classification. A method based on the adaptive threshold calculation is proposed for pulse detection in geoacoustic emission signals. The authors propose to analyze detected pulses using sparse approximation methods, in particular, the method of the adaptive matching pursuit. This method allows one to decompose a pulse into basis functions of combined Gauss-Berlage dictionary with minimum spatial and temporal costs and with the required accuracy of constructed approximations. The obtained sparse representations are described under the object approach as a combination of informative features identified during the analysis, for example, the number of functions in decomposition, function parameters etc. The object description of geoacoustic emission pulses is supplemented by an original structural description based on the relations of pulse local extremums. That made it possible to reduce significantly 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 a Geophysical Signal Catalogue.