Application of the Optimum Wavelet Packet Transform in Seismic Signals De-Noising
详细信息
- 责任者：Zhang Ruihong (Civil and Environmental Engineering School ; University of Science and Technology Beijing ; Beijing 100083 ; China) ; Lin Dachao
- 刊名：Journal of Seismological Research
- 出版年：2011
- 卷期：34(3)
- 关键词：远震信号 ; teleseismic signals
- 页码：p.358-364
- 图表：5 illus., 1 table, 14 refs.
- 分类号：0500
- 出版序号：126
- issnNo：ISSN1000-0666
- isbnNo：CN53-1062/P
摘要
The authors apply the node-dependent threshold relative to the characteristics of the time-frequency of the noise to the optimum Wavelet Packet Transform(WPT) method to denoise a synthetic noisy signal of the arrival of the simulative seismic wave,an experimental micro-seismic signal collected by a digital acoustic emission instrument,SDAES,and a seismic signal of 2007 Noto Hanto Earthquake in Japan recorded at NIED observatory.We find that the signal denoised by the optimum WPT method has a higher signal-to-noise ratio(SNR) and a lower distortion than those by other methods based on wavelet transform(WT) methods,and the WPT method shows the overall superiority.
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