Abstract
The detecting of infrasonic signals from impulsive sources based on the mathematical model of their wavelet spectrum forms characteristic of signals from impulsive sources (explosions, volcanic activity, and others) is proposed. This model is based on wavelet spectra analysis of infrasonic signals from different sources. Modeling is based on morphological image analysis methods that are invariant to changes in signal recording conditions. The wavelet spectrum of a signal is a function of time and frequency, i.e., it depends on two arguments varying on a rectangular grid, and the value of this function (its module or the module of its real part) is considered as image brightness. The spectrum section corresponding to a signal from a source is approximated by a piecewise constant image, and the geometric form of its spots with the same brightness determines the model of spectral images of signals from different sources. It is shown that, for different impulsive sources, the characteristic form of these spots is conserved and at the same time it significantly differs from the forms that are characteristic of the wavelet spectra of signals from other sources (microbaroms, mountain associated waves, and auroral infrasonic waves). A morphological method of searching for wavelet spectrum sections of signals that are characteristic of impulsive sources is proposed.
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All authors contributed to the study conception and design. The problem statement was performed by SNK. The development of morphological analysis methods was carried out by AIC. The analysis of experimental data was carried out by NDT. The computational experiment was performed by MNZ. The first draft of the manuscript was written by AIC, and all the authors commented on the previous versions of the manuscript. All authors have read and approved the final manuscript.
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Chulichkov, A.I., Tsybulskaya, N.D., Zakirov, M.N. et al. Detecting Infrasonic Signals from Impulsive Sources on the Basis of Their Wavelet Spectrum Forms. Pure Appl. Geophys. 179, 4609–4625 (2022). https://doi.org/10.1007/s00024-022-03183-w
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DOI: https://doi.org/10.1007/s00024-022-03183-w