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Anomaly Detection Method of Borehole Strain Network Topology Structure Based on Multi-channel Singular Spectrum

A technology for network topology and anomaly detection, which is applied in the field of anomaly detection of borehole strain network topology based on multi-channel singular spectrum, can solve problems such as inapplicability of joint analysis of multiple observation sites, and achieve the effect of strong reliability

Active Publication Date: 2021-03-23
JILIN UNIV
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Problems solved by technology

However, the joint analysis of multiple observation sites not only needs to extract effective crustal deformation signals, but also considers the common characteristics among multiple observation sites, so it is not suitable for joint analysis of multiple observation sites

Method used

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  • Anomaly Detection Method of Borehole Strain Network Topology Structure Based on Multi-channel Singular Spectrum
  • Anomaly Detection Method of Borehole Strain Network Topology Structure Based on Multi-channel Singular Spectrum
  • Anomaly Detection Method of Borehole Strain Network Topology Structure Based on Multi-channel Singular Spectrum

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Embodiment

[0095] For the Lushan earthquake, take the borehole strain data of earthquake precursor monitoring stations in Sichuan and Yunnan as an example. The schematic diagram of the Lushan earthquake epicenter and the locations of the six earthquake precursor monitoring stations is as follows figure 2shown. The data is measured by the YRY four-component borehole strain gauge, which is sampled once a minute. The time period of our research is from July 1, 2012 to June 30, 2013.

[0096] Step 1. Select 6 borehole strain stations in the study area as network nodes. Define borehole strain stations in the area as nodes V of the strain network l ,l=1,2,...6.

[0097] Step 2: Set the time window length n=1440, and the moving step step=1440, which means observing day by day. Let the borehole strain observation sequence of each station in the window be x ij ,i=1,2,...,1440, the observation data of 6 stations such as image 3 shown. The 6-dimensional node matrix X of borehole strain is...

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Abstract

The invention is a method for detecting abnormal topology structure of borehole strain network based on multi-channel singular spectrum. N borehole strain stations are selected as N network nodes; a time window length n and a moving step step are set to construct a time window. A multi-dimensional node matrix with a borehole strain size of n×N within the system; the multi-dimensional node matrix is ​​subjected to multi-channel singular spectrum analysis, and after decomposition, the eigenvectors and corresponding spatial and temporal principal components are obtained; high-frequency components are selected to reconstruct the effective components of each network node; Calculate the Pearson correlation coefficient between two nodes; connect two network nodes with a correlation coefficient greater than 0.8, construct the edges of the strain network, and write the adjacency matrix of the strain network; calculate the topological structure properties of the strain network; and move the time window to construct The strain network within the time window is calculated and the topological structure properties are calculated; the evolution diagram of the borehole strain network structure is output to determine earthquake-related anomalies. The invention realizes joint analysis of multiple stations of borehole strain data.

Description

technical field [0001] The invention belongs to the field of data processing of borehole strain observation data, in particular to a method for detecting anomalies of borehole strain network topology structure based on multi-channel singular spectrum. Background technique [0002] Inspired by the "Plate Boundary Observation (PBO)" in the United States, China has transformed and established about 100 borehole strain observation points, including about 40 sets of YRY-4 four-element borehole strain gauges and about 60 sets of TJ type borehole strain gauges. instrument. The installation depth of the YRY-4 borehole strain gauge is about 40m, while the depth of the TJ borehole body strain gauge is about 60m. The sampling interval of the established borehole strain observation points is 1 minute. After years of operation, most of the observation instruments at the observation points are in stable working condition, and smooth solid tides can be clearly recorded. In particular, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/00G01V1/28G01V1/30
CPCG01V1/28G01V1/30G01V1/01
Inventor 朱凯光于紫凝池成全樊蒙璇贺小丹孙慧慧
Owner JILIN UNIV
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