A Synthetic Solution for Identification and Extraction of the Effective Microseismic Wave Component Using Decomposition on Time, Frequency, and Wavelet Coefficient Domains

Figure 8

Changes in the magnitude of the maximum wavelet coefficient of the monitored microseismic wave and random noise with the decomposition level. The maximum coefficient magnitude of the monitored microseismic wave increases first from level 3 to level 5 and then decreases after level 5. The maximum coefficient magnitude of random noise continues to increase in a fluctuating manner until reaching level 8. The microseismic wave achieves the best wavelet packet decomposition at level 5.