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| The research about new method of picking onset of microseismic P-wave based on power of damping energy |
| LI Shulin，TANG Chao，LIU Yinchi |
| (School of Architecture and Civil Engineering，Xiamen University，Xiamen，Fujian 361005，China) |
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Abstract In practical applications，unreasonable setting of the threshold value and the calculation time window will lead to a larger error in the algorithm of picking onset of P-wave. Based on this，a method based on tracking the power of damping energy to overcome the shortcomings of the traditional method. The method is that transform the signal into a response domain of a single-degree-of-freedom (SDOF) oscillator with viscous damping and then tracks the variation of the power of damping energy to pick P-wave phases by combining the histogram method and AIC method. This method has the advantages of recognizing noise signal，no detection threshold setting，and no detection window selection. The results show that the proposed method has better anti-noise performance than the traditional method under different SNR. Using this method，40 different Signal-to-noise ratio waveforms monitored in practice were picked up at the onset of P wave，and manual picking after local amplification was taken as the standard. By comparing and analyzing the results with the STA/LTA method，the mean error of the method in this paper was 1.17 ms. The errors within 2 ms account for 87.5% and the errors within 4ms account for 100%. While，the mean error of STA/LTA method is 3.46 ms，and the errors within 2 ms account for 55%，and the errors within 4ms account for 82.5%. It can be concluded that the method proposed in this paper is better. The results of microseismic monitoring in Shizhuyuan mine show that this method can significantly improve the accuracy of source location in microseismic and has important theoretical and practical significance.
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2021, Vol. 40 
