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Preliminary study and application of amplitude-phase method of digital geomagnetic data by using the filtering method

FENG Zhi-sheng~1,ZHANG Su-ping~2,MEI Wei-ping~1,JU Hai-hua~1,ZHANG Xiu-xia~1,YANG Cong-jie~1(1.Earthquake Administration of Jiangsu Province,Nanjing 210014;2.Earthquake Administration of Gansu Province,Lanzhou 370000,China)  
Based on the periodic characteristics of the anomaly of the daily variation of geomagnetic Z component,by using the data of FHD Magnetometer in the 1.0 min sampling rate,we filter out the variation whose period is from 1 to 3 hour from the daily variation of Z component using the method of Fourier estimate,and then we extrude the anomaly of the daily variation of Z component,get the anomaly of amplitude-Phase method.The new method only requires the data of geomagnetic Z component of one station in the 1.0 min sampling rate,and overcomes the limitation of the old amplitude-phase method which requires the data of two stations.The new method is convenient to get the anomaly,and widen the application field of digital geomagnetic data.
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