Seafloor seismograph position and orientation inversion method based on water wave first arrival polarization orientation

A technology of polarization azimuth and seismograph, applied in seismology, seismology, instruments, etc. in areas covered by water, can solve problems such as non-convergence, and achieve fast convergence speed, good stability, and good accuracy Effect

Active Publication Date: 2019-08-20
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method adopts the method of linear inversion,

Method used

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  • Seafloor seismograph position and orientation inversion method based on water wave first arrival polarization orientation
  • Seafloor seismograph position and orientation inversion method based on water wave first arrival polarization orientation
  • Seafloor seismograph position and orientation inversion method based on water wave first arrival polarization orientation

Examples

Experimental program
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Effect test

Embodiment 1

[0042] This embodiment provides a position and azimuth inversion method of a submarine seismograph based on the first arrival polarization azimuth of water waves, specifically:

[0043] S1. According to the design deployment position of the submarine seismograph to be corrected, use the seismograph to receive the three-component seismic waveform signals of N shot points in different positions

[0044] S2. It is assumed that the designed deployment position of the submarine seismograph to be corrected on the seabed is (x, y), the actual position is (x+δx, y+δy), and (δx, δy) is the offset.

[0045] According to the nature of the longitudinal wave, the polarization direction of the longitudinal wave is the same as the direction of propagation, so the first arrival polarization orientation of the signal emitted by the shot point is consistent with the direction in which the position of the submarine seismograph to be corrected points to the shot point, and the position of the subm...

Embodiment 2

[0064] This embodiment aims to provide an error calculation method for the inversion result obtained by the method described in Embodiment 1.

[0065] In this embodiment, the bootstrap method is used to give the error estimation of the inversion results. The specific method is to generate a set of theoretical observation data according to the actual shot point / station position according to the given actual first-arrival polarization data and azimuth error information, and The residual of the original data is randomly added to the theoretical data, and then the inversion calculation is performed on these theoretical observation data, and the statistical variance of the result is used as the error.

[0066] For a submarine seismograph, it is assumed that there are N shot point data involved in the calculation, and the data involved include the station’s horizontal position and azimuth (lat, lon, φ 0 ), shot point coordinates, azimuth and residuals (lat i , lon i , θ i , r i ...

Embodiment 3

[0072] This example aims to further test the method described in Example 1.

[0073] In order to test the above method, this example carried out theoretical model tests and actual data processing respectively. The data used came from the OBS observation conducted in a certain area of ​​the South my country Sea in 2003. There were 5 OBS stations for this observation. The theoretical model adopts the actual observation system of obs4, and adds a random disturbance with a mean value of 0 and a Gaussian distribution to the azimuth obtained by theoretical calculation. The variance of the random disturbance is 6°, (φ 0 , δx, δy) the true value of each value is 0. Table 1 shows the statistical results of 1000 such calculations. From the results in Table 1, it can be seen that the results of the nonlinear inversion method are better than those of the linear inversion method, and the average value of each inversion quantity is closer to the true value. , the variance is also smaller. ...

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Abstract

The invention discloses a seafloor seismograph position and orientation inversion method based on water wave first arrival polarization orientation. A nonlinear inversion method is adopted. For a submarine seismograph to be corrected, the difference of the water wave first arrival polarization azimuth residuals is constructed. The position of the seismograph which minimizes an objective function is acquired. After the exact position of the seismograph is acquired, the actual orientation of the seismograph is acquired by using the difference between the shot point orientation and the polarization orientation. In particular, the sum of the squares of the difference of pairs of water wave first arrival polarization azimuth residuals is taken as the objective function. A DE optimization methodis used to acquire the position of the seismometer which minimizes the objective function. The influence of the seismograph orientation is eliminated in the objective function. The method has the advantages of faster convergence speed and better stability, and has better accuracy than a linear method.

Description

technical field [0001] The invention relates to a position and method inversion method of a seabed seismograph, in particular to a position and azimuth inversion method of a seabed seismograph based on the first arrival polarization azimuth of water waves. Background technique [0002] After the OBS submarine seismograph is deployed on the seabed, its azimuth is usually random. Due to the influence of factors such as ocean currents, its actual position will usually deviate from the predetermined position. Therefore, it is necessary to invert its position and azimuth. The traditional method adopts the method of linear inversion, and in some special cases, there are cases of non-convergence. Contents of the invention [0003] Aiming at the deficiencies in the prior art, the present invention aims to provide a position and azimuth inversion method of a seabed seismograph based on the first arrival polarization azimuth of water waves. Using a nonlinear inversion method, for a ...

Claims

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Application Information

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IPC IPC(8): G01V1/38
CPCG01V1/3852G01V2210/1427
Inventor 刘劲松
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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