Time-frequency spectrum analyzing method for processing earthly natural pulse electromagnetic field data

Abstract

The invention belongs to application of the non-stationary data analysis field, and particularly relates to a time-frequency spectrum analyzing method for processing earthly natural pulse electromagnetic field data. The time-frequency spectrum analyzing method comprises the following steps: adding normal distribution white noises into original earthly natural pulse electromagnetic field signals, continuously adding the normal distribution white noises and performing EEMD (ensemble empirical mode decomposition) on the original earthly natural pulse electromagnetic field signals until a group of IMF (intrinsic mode function) components with a single frequency are obtained, performing WVD (Wigner-Ville distribution) decomposition on each IMF component, and summing WVD decomposition results. By the time-frequency spectrum analyzing method for processing the earthly natural pulse electromagnetic field data, relatively obvious distribution abnormality of a time-frequency energy spectrum before an earthquake can be acquired, so that time-frequency characteristics of seismogenic information can be effectively studied on the basis of earth natural pulse electromagnetic field analysis.

Description

technical field [0001] The invention relates to a time-frequency spectrum analysis method for data processing of the earth's natural pulsed electromagnetic field, which belongs to the application field of non-stationary data analysis. Background technique [0002] The invention belongs to the field of earthquake precursor research and earthquake prediction. Earthquakes bring huge disasters to human life. According to statistics, among the natural disasters in the world, the death toll caused by earthquakes accounts for 54% of all natural disasters, which can be called the most natural disasters. How to predict earthquakes has always been a hot and sensitive topic. However, due to the three major difficulties in earthquake prediction, the "impenetrability" of the earth's interior, the "infrequent occurrence" of large earthquakes, and the "complexity of the physical process of earthquakes", earthquake prediction is a recognized worldwide problem. It is difficult to obtain ob...

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Problems solved by technology

However, due to the three major difficulties in earthquake prediction, the "impenetrability" of the earth's interior, the "infrequent occurrence" of large earthquakes, and the "complexity of the physical process of earthquakes", earthquake prediction is a recognized worldwide problem. It is difficult to obtain obvious anomalies in the distribution of pre-earthquake time-frequency energy spectrum from the Earth's natural pulsed electromagnetic field data

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