Theoretically, the current spectra of seismic signals generated by a moving source and recorded by a sensor mounted on the ground surface near the track are analyzed. A two-dimensional representation of the signal power spectral density is used as a function of two arguments: source coordinate - frequency. The illustrations demonstrate the reliefs corresponding to the two-dimensional representation of the spectral characteristics of the seismic signal recorded at different speeds of the source. The features of the signal level change curve during source and terrain movement in a two-dimensional representation of the current spectrum are discussed depending on the ratio of sedimentary stratum parameters: the upper layer and the underlying half-space. The possibility of estimating the speed and determining the direction of source motion based on registration by a single receiver is shown.
$^1$Federal State Budgetary Scientific Institution "Federal Research Center The Institute of Applied Physics of the Russian Academy of Sciences" (IAP RAS)
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