Application of PWVD in Time-Frequency Analysis of Geomagnetic Field
详细信息
- 责任者：He Kang (Earthquake Administration of Anhui Province ; Hefei 230031 ; China) ; Yan Rui
- 刊名：Earthquake Research in China
- 出版年：2013
- 卷期：29(1)
- 关键词：地震前兆 ; precursor ; 地磁场 ; geomagnetic field ; 四川 ; Sichuan Province
- 页码：p.157-167
- 图表：illus., 39 refs.
- 分类号：0500
- issnNo：ISSN1001-4683
- isbnNo：CN11-2008/P
摘要
Using Pseudo Wigner-Ville Distribution(PWVD) in time-frequency analysis of geomagnetic Z-component on magnetically quiet and disturbed days, we discover geomagnetic daily variations with period 6～24 hour in all stations. The part with period 2～6 hour is not only influenced by external field, but also contains regional information, which shows the characteristics of crustal and induction field. Using Smoothed Pseudo Wigner-Ville Distribution (SPWVD) in time-frequency analysis of geomagnetic Z-component before the Wenchuan MS8.0 earthquake, we found that the geomagnetic stations near the epicenter recorded an abnormal signal with period 4.4 hour before the major earthquake, and the amplitudes of the signal in different stations decreased with epicentral distance increased.
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