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EARTHQUAKE ›› 2006, Vol. 26 ›› Issue (1): 93-98.

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

FENG Zhi-sheng1, ZHANG Su-ping2, MEI Wei-ping1, JU Hai-hua1, ZHANG Xiu-xia1, YANG Cong-jie1   

  1. 1. Earthquake Administration of Jiangsu Province, Nanjing 210014;
    2. Earthquake Administration of Gansu Province, Lanzhou 370000, China
  • Received:2005-06-06 Revised:2005-07-04 Published:2021-11-01

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Abstract: 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.

Key words: Geomagnetic Z component, Digital geomagnetic, Daily variation, Anomaly, Filtering amplitude-phase method

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