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

Table 2

Comparison of the SNR value and the energy-reservation ratio of the effective wave processed using diverse approaches.

	Tri-domain; decomposition method	Independent wavelet methods
		Wavelet packet transform		Wavelet transform
		Compression; (3.72 × 10^−3)	Denoising; (3.72 × 10^−3)	Compression; (1.881 × 10^−3)	Denoising
SNR (dB)	10.797	8.855	5.329	10.134	10.198
(%)	92.317	88.484	60.336	91.163	89.009

Coefficient thresholds for the wavelet denoising at levels 1, 2, 3, 4, and 5 are 2.096 × 10⁻³, 1.258 × 10⁻³, 1.013 × 10⁻³, 0, and 0, respectively.