METHOD FOR DETERMINING THE ULTIMATE ACCURACY OF ESTIMATING MICROSEISMIC QUASI-STATIONARY NOISE BACKGROUND Russian patent published in 2021 - IPC G01V1/28 G01V1/30 

FIELD: quasi-stationary microseismic noise background studying.

SUBSTANCE: invention relates to a method for studying a quasi-stationary microseismic noise background of the Earth (MNB), taking into account the manifestation of its instability. The method registers and preselects a sufficiently long segment of the recording of the MNB signal with a duration of about one hour or more without obvious violations of a stationary nature. Then, multiple division of the recorded MNB signal into groups of clusters of different durations, covering the entire analyzed time range, is performed. After that, the scatter is determined for the formed groups of clusters in the form of Allan deviation, depending on the duration of the cluster. Then an Allan deviation diagram is plotted depending on the duration of the cluster. After that, the minimum point is determined on the constructed Allan deviation diagram and, by its coordinates, the required accumulation duration and the maximum achievable accuracy of the MNB signal estimation are determined, while observing stationarity.

EFFECT: claimed invention makes it possible: 1) to correctly and reliably determine the spread of the MNB signal exhibiting nonstationarity, 2) to monitor in detail the course of accumulation of the results of evaluating the MNB signal and to identify its nature at individual stages, as well as to identify the region of signal stationarity, 3) to determine the required duration of signal accumulation, and to determine the corresponding maximum achievable accuracy of estimating the MNB signal, limited by its nonstationarity.

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