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《Chinese Journal of Geophysics》 2006-03
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Wavelet analysis as a tool for revealing geomagnetic precursors of the Zhangbei earthquake

LI Qi,LIN Yun-Fang,ZENG Xiao-PingInstitute of Geophysics,China Earthquake Administration,Beijing 100081,China  
We study the minutely geomagnetic field values of six months recorded by six observatories around the epicenter by wavelet and FFT(Fast Fourier Transform) analysis in order to reveal the geomagnetic precursors of the Zhangbei earthquake,which occurred on Jan.10,1998.It is found that abnormal frequency structure of vertical(Z) component appeared before the Zhangbei earthquake and transferred from south to north.The occurrence rate of the abnormal frequency structure increased as the time approached to the earthquake occurrence.However,no similar phenomenon is found for horizontal(H) and deviation(D) components.The space distribution of amplitudes in different observatories is close to steady four-quadrant pattern in those days with abnormal frequency structure,and the epicenter is located at contours of 0~3nT.The results indicate that the geomagnetic precursors do exist,and wavelet analysis is effective for revealing such precursor.
【Fund】: 地震科学联合基金青年课题(604008)资助
【CateGory Index】: P315.63
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