Removal of Tidal Strain Components from Borehole Strain Data Based on Minimum Noise Separation

A noise separation and strain component technology, applied to complex mathematical operations, pattern recognition in signals, instruments, etc., can solve the problems of not considering the physical meaning of harmonics, lack of pertinence, and removal of tidal strain components of borehole strain data, etc.

Active Publication Date: 2020-11-27
JILIN UNIV
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Problems solved by technology

But so far, there is no report on the removal of the tidal strain component of borehole strain data by using the method of minimum noise separation
Existing methods do not consider the physical meaning of each harmonic and lack pertinence; some require calculation of theoretical solid tides, which requires a large amount of calculation

Method used

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  • Removal of Tidal Strain Components from Borehole Strain Data Based on Minimum Noise Separation
  • Removal of Tidal Strain Components from Borehole Strain Data Based on Minimum Noise Separation
  • Removal of Tidal Strain Components from Borehole Strain Data Based on Minimum Noise Separation

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Embodiment Construction

[0059] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0060] Take the borehole strain minute data of Guza earthquake precursor monitoring station in Sichuan area as an example. The data were measured from January 1, 2012 to December 31, 2013 using the YRY four-component borehole strain gauge.

[0061] a, Enter the borehole strain data S 1 , express the data of borehole strain per day as: X 1 =[X 1 (1), X 1 (2),...,X 1 (1440)],...,X 731 =[X 731 (1), X 731 (2),...,X 731 (1440)], sample matrix y=[X can be obtained 1 , X 2 ,...,X 731 ] T ,Such as figure 2 shown. The expression of the sample matrix y(731×1440) is:

[0062]

[0063] b, Using the adaptive window w...

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Abstract

The invention relates to a method for removing tidal strain components of borehole strain data based on minimum noise separation, which uses an adaptive window width filtering algorithm to estimate the high-frequency signal of the borehole strain data sample matrix; calculates the covariance matrix of the estimated high-frequency signal , and perform eigenvalue decomposition; use the covariance matrix of the high-frequency signal to construct the adjustment matrix; use the constructed adjustment matrix to adjust the covariance matrix of the borehole strain data sample matrix; The covariance matrix is ​​subjected to the minimum noise separation transformation and the minimum noise separation transformation components are obtained. The matrix formed by the minimum noise separation transformation components is expressed as; the harmonic period of the minimum noise separation component is calculated; the harmonic period is selected to be the same as the tidal strain component harmonic period Reconstruct the corresponding minimum noise separation components; calculate and remove the data of the tidal strain component, and remove the tidal strain component in a targeted manner, without calculating the theoretical solid tide.

Description

technical field [0001] The invention relates to the field of borehole strain data processing, in particular to a method for removing tidal strain components of borehole strain data based on minimum noise separation. Background technique [0002] The deformation of the earth's surface, the tectonic movement inside the crust and various geological disasters are closely related to the crustal stress. The change of the stress-strain state of the crust is the most direct cause of fractures, folds and even earthquakes. Borehole strain observation is an important earthquake monitoring method to discover and grasp the (long) medium-term-short-term-imminent earthquake strain precursor and the temporal and spatial distribution and development law of post-earthquake adjustment through the fine observation of the continuous change of the stratum's internal strain state according to time. Precursor observation means. Borehole strain observation can clearly record the tidal response of s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G06F17/16G06F17/18
CPCG06F17/16G06F17/18G06F2218/04
Inventor 朱凯光池成全于紫凝樊蒙璇李凯艳孙慧慧
Owner JILIN UNIV
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