Identification method of weak seismic phases on the basis of wavelet packet transform |
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| Authors: | Xi-Qiang Liui Hui-Lan Zhou Zhi-Zhen Zheng Ping Shen Xuan-Hui Yang and Yan-Lu Ma |
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| Institution: | (1) Graduate School, University of Science and Technology of China, 100039 Beijing, China;(2) Center for Earthquake Data and Information, China Seismological Bureau, 100045 Beijing, China;(3) Seismological Bureau of Shandong Province, 250014 Ji’nan, China;(4) Institute of Geophysics, China Seismological Bureau, 100081 Beijing, China |
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| Abstract: | This paper describes a sort of new method identifying seismic phase by the name of wavelet packet transform. Perfectness and
development of the wavelet packet transform is based upon the idea of its multiscale analysis. The method of wavelet packet
transform can depict the anomalous changes information of transient spectra of seismic wave onset, and come true the target
of identifying seismic phase especially weak seismic phase. Then this paper presents discriminating examples of simulating
digital signals and actual seismic phase. Compared with conventional seismic phase discrimination, studied results show that
the wavelet packet transform method is an available tool of weak signal analyses, and have unexampled merits and attractive
application foreground.
This research gets hold of Higher School Doctor Scientific Research Foundation (No. 157 WJ0704 9435611) and supported by the
National Natural Science Foundation (No. 49474211). |
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| Keywords: | wavelet transform wavelet packet transform transient spectra analysis weak seismic phase discrimination |
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