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Research on Low-frequency Wave of the Broadband Digital Data and the Information of Short-imminent Precursor before Strong Earthquakes

YIN Liang1,YANG Li-ming2(1.Gaotai Seismic Station,Earthquake Administration of Gansu Province,Gansu Gaotai 734300,China;2.Earthquake Administration of Gansu Province,LanZhou 730000,China)  
Through the studing on the broadband digital seismic data from Gaotai,Lanzhou,Chengdu and Anxi seismic stations,the spectral variation of low-frequency wave before the west to Kunlun Mountain Pass earthquake with MS=8.1 in 2001,Wenchuan MS8.0 earthquake in 2008 and Minle-Shandan MS6.1 earthquake in 2003,is analyzed,and the characteristics of short-impending term precursory anomaly in the data is summarized in frequency domain.I t is found that the amplitude of frequency in 0.1~0.14 Hz increases gradually in a few days before strong earthquake.The mechanism of the anomaly is discussed also combined with tectonic features of the earthquake source area and the low-frequency wave is considered has relation with quiet-earthquake and slow-earthquake.
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