Aseismic dynamic background field based extraction method of seismic TEC abnormal information

Abstract

The invention provides an aseismic dynamic background field based extraction method of seismic TEC abnormal information. The method comprises the following steps of establishing a dynamic background field, carrying out wavelet multi-scale analysis, utilizing a support vector machine regression model and carrying out a method for extracting abnormal information. According to the extraction method,through an aseismic dynamic background field, the own periodical change of a TEC is considered; meanwhile, the interference of space environments of a solar activity and a geomagnetic activity and thelike are also considered; an extractable seismic TEC abnormality is more accurate; meanwhile, the interference and error brought by other aseismic factor in the process of extracting seismic ionospheric TEC abnormal information can be reduced; the detection accurate rate of the seismic TEC abnormality is improved; the method has a higher early warning rate during a seismic period and a lower false warning rate during an aseismic period; and the extraction efficiency of the seismic TEC abnormal information can be improved.

Description

technical field [0001] The invention relates to the field of seismic TEC information extraction, in particular to a method for extracting seismic TEC abnormal information based on non-seismic dynamic background field. Background technique [0002] The ionosphere is an important part of the space environment of the sun and the earth, and its drastic changes will have a huge impact on human production and life. [0003] The existing seismic ionospheric TEC anomaly extraction mainly uses the following two methods: one is the sliding time window method; the other is the sliding quartile method, but there are many defects in the above two methods, for example: due to the The influence of periodic fluctuations of TEC itself is not considered, resulting in periodic information in the extracted anomalies; as the background field does not consider the influence of the disturbance of the earth's space environment caused by non-seismic factors such as solar activities, it makes it poss...

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Problems solved by technology

[0003] The existing seismic ionospheric TEC anomaly extraction mainly uses the following two methods: one is the sliding time window method; the other is the sliding quartile method, but there are many defects in the above two methods, for example: due to the The influence of periodic fluctuations of TEC itself is not considered, resulting in periodic information in the extracted anomalies; as the background field does not consider the influence of the disturbance of the earth's space environment caused by non-seismic factors such as solar activities, it makes it possible to A large number of TEC anomalies can be extracted, and there is a high false alarm rate; at the same time, when earthquake events and other non-seismic disturbance events occur at the same time, the source of TEC anomalies cannot be identified

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