ИСТИНА

The features of temporal realizations of various geophysical fields and their seasonal variationsseismic catalogs, noise at receiving stations, gps variations, magnetic field, and apparent electrical resistance are considered. An overview of the presence of a seasonal signal in real time series of various geophysical parameters is given. A wide variety of seasonal signals has been established even for the same geophysical process; examples of the absence of a season or the doubtfulness of its presence are given. Examples of the nonlinear contribution of the season are considered. Mechanisms for creating artificial time series are considered. A multiplicative model of a mixture of random noise and Flicker noise with various types of seasonal variations and other periodic components is considered. Various cases are shown when the season has a visible contribution to the model. A model for creating a random catalog of events is considered and the noise hypothesis of the appearance of a season in such a catalog is estimated. For this, modulation of such a catalog with a periodic seasonal signal was used. The noise hypothesis was tested both for events that did not fall under the noise and for those that were above the noise. When assessing the accuracy of the selection of the expected useful signal, the analysis of the possibility of filtering seasonal variations in both natural and artificial time series is carried out. The use of such methods for our earlier study of periodicity in various geophysical processes is critically examined.