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| Wave separation for the great Sumatra-Andaman earthquake with regional seismic array |
| Chunyan Zhang1, Sidao Ni2 |
1 Key Lab of Intelligent Computing and Signal Processing of Ministry of Education, School of Mathematics, Anhui University, Hefei 230039, China
2 Key Laboratory of Dynamic Geodesy, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China |
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Abstract We analyzed the seismic waveforms from the December 26, 2004 Sumatra-Andaman earthquake recorded at broadband seismic stations in western Europe. Previous studies involving of the beam-forming technique and high frequency analysis suggest that the earthquake ruptured with a duration of around 500 s. This very long duration makes P wave overlap with later arrivals such as PP wave, which follows P in about 200 s. Since P waves are crucial for modeling earthquake processes, we propose an iterative method to separate P and PP waveforms. The separated P waveform confirms a second large energy release around 300 s after the initial rupture. The iterative signal separation technique is particularly useful for mixed signals that are not independent and the number of recording stations far exceeds number of mixed signal sources.
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Received: 06 September 2010
Published: 10 February 2011
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| Fund:CAS fund (KZCX2-YW-116-1), National Natural Science Foundation of China (40821160549 and 41074032) and China Earthquake Administration fund (200808078) |
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Corresponding Authors:
Sidao Ni
E-mail: sdni@whigg.ac.cn
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