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Method and device for identifying asymmetric waveforms in strong earthquake records

An asymmetric waveform and symmetric technology, which is applied in measuring devices, seismology, seismic signal processing, etc., can solve problems such as poor symmetry and affecting the reliability of seismic analysis results, and achieve accurate data, simple discrimination standards, and improved accuracy. Effect

Active Publication Date: 2018-09-04
INST OF ENG MECHANICS CHINA EARTHQUAKE ADMINISTRATION
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Problems solved by technology

However, in the actual strong earthquake observation work, due to the influence of many factors (impact on the upper structure of the observation station, the amplification effect of a certain direction of the soil layer, the uncorrected error of the instrument itself, etc.), the records obtained are often special. image 3 For example, the acceleration time-history record curve shows obvious asymmetry (that is, the symmetry of the history curve graph is poor on the baseline), and if the abnormal data cannot be eliminated, the seismic analysis results will be greatly affected reliability

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  • Method and device for identifying asymmetric waveforms in strong earthquake records
  • Method and device for identifying asymmetric waveforms in strong earthquake records
  • Method and device for identifying asymmetric waveforms in strong earthquake records

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Embodiment approach

[0048] In this embodiment, step S3 can be implemented in various ways, such as: using the integral rule of curved trapezoid to calculate the integral of the acceleration time history curve above and below the baseline, and judge the symmetry according to the calculated integral. In order to reduce the amount of computation and improve screening efficiency, this embodiment provides a preferred implementation of step S3, including the following steps:

[0049] Step S31, calculate the sum of all elements in the first array, denoted as A 1 .

[0050] Step S32, calculate the sum of all elements in the second array, denoted as A 2 .

[0051] Step S33, according to A 1 and A 2 , to determine whether the graph drawn by the acceleration data is a symmetrical waveform.

[0052] Wherein, there are many ways to implement step S33, and this embodiment provides a preferred implementation of step S33: calculate DIF=(A 1 +A 2 ) / (A 1 -A 2 ), if DIF is greater than or equal to the firs...

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Abstract

The invention relates to a method and apparatus for identifying an asymmetric waveform in a strong earthquake record. The method comprises: carrying out base line initialization on acceleration data in an obtained strong earthquake record; classifying corrected acceleration data into a first array and a second array by using a base line as a benchmark; carrying out a preliminary symmetry analysis on the first array and the second array and determining whether a graph drawn by the acceleration data is a symmetrical waveform; and if so, carrying out a precise symmetry analysis on the first array and the second array and determining further whether the graph drawn by the acceleration data is a symmetrical waveform. According to the method and apparatus provided by the invention, advantages of two kinds of symmetric analysis methods are combined; and the identification efficiency can be guaranteed and the screening accuracy can be improved; abnormal data in a strong earthquake record can be rejected; and the earthquake analysis result reliability can be enhanced.

Description

technical field [0001] The invention relates to the technical field of seismic data analysis, in particular to a method and device for identifying asymmetric waveforms in strong earthquake records. Background technique [0002] In the strong motion observation work, after obtaining the first-hand earthquake data, it is necessary to start processing immediately for earthquake emergency and scientific research work such as intensity rapid report and earthquake characteristics analysis. The most direct object in this process is the strong The acceleration records (i.e., the acceleration time-history curve) obtained by the shaking station usually have good symmetry, that is, the overall history curve has good symmetry about the time axis, and the acceleration time-history amplitude does not appear to be significantly shifted to one side phenomenon, and the time-course graphical features are clear and easy to analyze, such as figure 2 shown. However, in the actual strong earthq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30G01V1/36
CPCG01V1/30G01V1/366G01V2210/324G01V2210/42
Inventor 周宝峰徐长琦任叶飞温瑞智谢礼立
Owner INST OF ENG MECHANICS CHINA EARTHQUAKE ADMINISTRATION
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