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

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基于数字地磁资料的滤波幅相法初步应用研究

冯志生1, 张苏平2, 梅卫萍1, 居海华1, 张秀霞1, 杨从杰1   

  1. 1.江苏省地震局, 江苏 南京 210014;
    2.甘肃省地震局, 甘肃 兰州 730000
  • 收稿日期:2005-06-06 修回日期:2005-07-04 发布日期:2021-11-01
  • 作者简介:冯志生(1961-), 男, 江苏海安人, 副研究员, 1987年获硕士学位, 主要从事震磁及前兆台网观测等研究。
  • 基金资助:
    “十五”国家科技攻关项目(2004BA601B01-03-02)

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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摘要： 根据地磁垂直分量日变化畸变异常的周期特征, 应用FHD磁力仪分钟值观测资料, 通过富氏拟合滤出1~3 h的日变化,突出垂直分量日变化中的畸变变化, 直接获取了幅相法异常。 新方法只需单台的垂直分量分钟值观测资料, 克服了原有幅相法需要参考台资料的缺陷, 方便了异常提取, 拓展了数字地磁观测资料的应用范围。

关键词: 地磁垂直分量, 数字地磁, 日变化, 畸变异常, 滤波幅相法

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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