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A Method of Abnormal Extraction of Borehole Strain Data Based on s-k Feature

A technology of data anomalies and extraction methods, applied in seismology, instruments, measuring devices, etc.

Active Publication Date: 2019-07-26
JILIN UNIV
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Problems solved by technology

So far, there has been no report on abnormal extraction of borehole strain data by methods of skewness and kurtosis

Method used

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  • A Method of Abnormal Extraction of Borehole Strain Data Based on s-k Feature
  • A Method of Abnormal Extraction of Borehole Strain Data Based on s-k Feature
  • A Method of Abnormal Extraction of Borehole Strain Data Based on s-k Feature

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Embodiment

[0040] For the Wenchuan earthquake, take the borehole strain data of Zhongguza Station, an earthquake precursor monitoring station in Sichuan as an example. Guzan station and the epicenter of the Wenchuan earthquake are as follows figure 2 shown. The data was measured by a YRY four-component borehole strain gauge, sampled once a minute, and the study period was from January 1, 2007 to July 1, 2009. see figure 1 shown:

[0041] Step 1. Enter the borehole strain data, and verify the validity of the data. Yes, go to the next step. Entering the borehole strain data is to select the four-component borehole strain data of a station and make it into a time series sampled according to the minute value. . Data validity verification is based on different components, specifically:

[0042] Enter the time series of the minute value of borehole strain at Guza station from January 1, 2007 to July 1, 2013, and record the data as S in the order of north-south component, east-west compon...

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Abstract

The invention belongs to the field of earthquake precursor observation data anomaly detection. Specifically, it is a borehole strain data anomaly extraction method based on S-K characteristics. First, the borehole strain data sequence of the same station is subjected to surface strain transformation calculation, and then The converted data is subjected to harmonic analysis and processing; the processed surface strain data is differentially calculated to form sample data; and the skewness and kurtosis of the surface strain sample data for each day are calculated; the obtained skewness and kurtosis are drawn on a in the plane, and found the parabolic relationship it showed; based on this relationship, it was found that the skewness kurtosis of the stationary data on most days was near zero, so a background when the crust was stationary was defined and the deviation from the background was calculated for each day. degree of movement. Through the present invention, the borehole strain data can be effectively analyzed and possible earthquake precursor anomalies can be extracted.

Description

technical field [0001] The invention belongs to the field of abnormal detection of seismic precursor observation data, in particular to a method for abnormal extraction of borehole strain data based on S-K feature. Background technique [0002] my country's borehole strain observation started earlier, especially the horizontal four-component borehole strain gauge pioneered, and its design concept is at the international leading level. During the National "Tenth Five-Year Plan" period, the four-component borehole strain gauge observation points developed rapidly, and the number of observation points has increased from a handful to more than 50. Some of these observation sites are already producing high-quality data. The primary purpose of the China Earthquake Administration's earthquake monitoring network is earthquake prediction. An important development direction of earthquake prediction research is the transition from "empirical prediction" to physical prediction. The c...

Claims

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Application Information

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