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《Chinese Journal of Geophysics》 2008-06
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The short-term anomalies detected by broadband seismographs before the May 12 Wenchuan earthquake,Sichuan,China

HU Xiao-Gang,HAO Xiao-Guang Key Laboratory of Dynamical Geodesy,Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan 430077,China  
We investigated broadband seismographic waveform data in 7~13 May 2008 from 40 seismic stations of the National Digital Seismograph Network of China(NDSN) after the 12 May 2008 Wenchuan earthquake,showing that obvious precursor was widely detected throughout China.The premonitory phenomena is that tremor amplitudes in the period band of 2~10 s have increased steadily within 1~3 days before the main shock rupture.Anomaly tremors can also be detected by gravimeters and tiltmeters.Tremor signals are widely detected in mainland China,but they are very strong in Southeastern China and weak in Western China.The possible slow slip of South China block before the great Wenchuan earthquake may be the cause of tremors,which is related to some frictional processes of the slow slip.
【Fund】: 国家自然科学基金(40774011 40874014 40874036);; 质检公益性行业科研专项基金“数字化地震前兆地壳形变观测方法标准研究”(10-215)资助
【CateGory Index】: P315.62
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