Extraction of seismic precursory information from gravity tide at Kunming station based on HHT

Hilbert-Huang Transformation （HHT） is a recently-developed method for non-linear signal processing （Huang et al, 1998）. By performing empirical mode decomposition （EMD） with HHT, various frequency components can be effectively separated as intrinsic mode function （IMF）. After Hilbert transformation...

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Bibliographic Details
Published in:Acta seismologica sinica 2007-03, Vol.20 (2), p.234-238
Main Author: 张立 傅容珊 周挚 山秀明 梁虹 全海燕
Format: Article
Language:English
Subjects:
Extraction
Gravitation
HHT
Seismic engineering
Seismic phenomena
Stations
Tides
地震前兆信息
昆明地震台
瞬时频率
重力潮
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Summary:Hilbert-Huang Transformation （HHT） is a recently-developed method for non-linear signal processing （Huang et al, 1998）. By performing empirical mode decomposition （EMD） with HHT, various frequency components can be effectively separated as intrinsic mode function （IMF）. After Hilbert transformation to the IMF se- quence, the 3-D discrete time-frequency spectrum containing time, frequency and amplitude can be obtained, which provides very clear time-frequency characteristics with local details. The method is suitable for describing siznals with non-linear and non-stable variations.
ISSN:1000-9116
1674-4519
1993-1344
1867-8777
DOI:10.1007/s11589-007-0234-5