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《Acta Seismologica Sinica》 2012-02
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Analysis on a few kinds of low frequency events and their waveforms before Wenchuan earthquake

Deng Jin1,2),Li Peng3) Ma Tengfei1) Zhao Lingyun4) 1) Institute of Geophysics,China Earthquake Administration,Beijing 100081,China 2) Lanzhou Institute of Seismology,China Earthquake Administration,Lanzhou 730000,China 3) Institute of Earthquake Science,China Earthquake Administration,Beijing 100036,China 4) Earthquake Administration of Hubei Province,Wuhan 430071,China  
This paper lists and analyzes a few kinds of low frequency events studied in foreign literature.By choosing broadband records at stations of Sichuan digital seismic network near main fault of the Wenchuan earthquake and band filtering these datum,we detected four similar low frequency events,i.e.,episodic tremor and slip events(ETS),low frequency events(LFE),deep low frequency events(DLF) and very low frequency events(VLF).Located examples confirm that several low frequency events occurred near the Longmenshan fault,most of them are ETS and VLF and minority is DLF.We can not verify whether LFE events actually exist or not,because there are distant earthquakes at the same time.As a supplement to traditional earthquake catalog,low frequency events may provide us a new research line for exploring possible precursors and triggering mechanism of strong earthquakes.
【Fund】: 中国地震局地球物理研究所基本科研业务专项(DQJB11B02);中国地震局地震预测研究所基本科研业务专项(02092407)资助
【CateGory Index】: P315.31
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