Mine microseismic signal denosing based on variational mode decomposition and independent component analysis

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (4) : 56-63.

HUANG Weixin,LIU Dunwen

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Abstract

Microseismic signal denoising plays an important role in P and S phase arrival picking,seismic event location,focal mechanism inversion,and so on.To handle this problem,a variational mode decomposition (VMD) and independent component analysis (ICA) based method was proposed.Firstly,VMD was applied to decompose microseismic into certain number mode functions,then correlation coefficient between each mode function and original microseismic signal was used to remove mode functions which have a large noise.For noise and useful signal mixed mode functions,the ICA method was adopted to extract the useful signal,then the extracted useful signal was combined with the rest low frequency mode functions,which was called the VMD_ICA denoised signal.In addition,a Sine function was used to remove the power frequency noise which remained in the VMD_ICA denoised signal.A signal test shows that both the VMD_ICA method and the VMD_ICA_Sine method can retain microseismic signal local features effectively,and their signal to noise ratios (SNRs) are higher than that based on removing some mode functions directly.The mine microseismic signal application further indicates that the VMD_ICA method and the VMD_ICA_Sine method can improve microseismic signal's SNR and P phase arrival picking quality of the PAI-K method,and the VMD_ICA_Sine method has a better denoising performance than the VMD_ICA method.In conclusion,the VMD_ICA_Sine method provides a good way for mine microseismic signal denoising.

Key words

Microseismic signal denoising / Variational mode decomposition (VMD) / Independent component analysis (ICA) / Sine function denosing / Signal to noise ratio (SNR) / P-phase arrival picking

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HUANG Weixin,LIU Dunwen. Mine microseismic signal denosing based on variational mode decomposition and independent component analysis[J]. Journal of Vibration and Shock, 2019, 38(4): 56-63

References

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