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Liu Jing, Huang Jianping, Zhang Xuemin, Shen Xuhui. 2013: Anomaly extraction method study and earthquake case analysis based on in-situ plasma parameters of DEMETER satellite. Acta Seismologica Sinica, 35(1): 72-83. DOI: 10.3969/j.issn.0253-3782.2013.01.008
Citation: Liu Jing, Huang Jianping, Zhang Xuemin, Shen Xuhui. 2013: Anomaly extraction method study and earthquake case analysis based on in-situ plasma parameters of DEMETER satellite. Acta Seismologica Sinica, 35(1): 72-83. DOI: 10.3969/j.issn.0253-3782.2013.01.008
shu

Anomaly extraction method study and earthquake case analysis based on in-situ plasma parameters of DEMETER satellite

  • 1.

    Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China

  • 2.

    Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

  • 3.

    University of Chinese Academy of Sciences, Beijing 100049, China

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  • Received Date: December 15, 2011
  • Revised Date: March 27, 2012
  • Published Date: December 31, 2012
    Graphical Abstract
    • Abstract
  • Based on in-situ plasma parameters observed by plasma analyzer (IAP) and Langmuir probe (ISL) of French DEMETER satellite, we studied 5 methods for anomaly extraction, i.e., variation of parameters with latitude, spatial interpolation, spatial difference, moving median and correlation analysis. The methods were applied to the study of 29 earthquakes from Jan. 2006 to Apr. 2010, including the M≥6.0 earthquakes in China and some M≥7.0 earthquakes worldwide. As the plasma parameters are correlated to a certain extent, when 2 or more parameters show abnormalities, they are accepted as disturbances before earthquakes. In-situ plasma parameter abnormalities were found before 15 of the 29 earthquakes. Through analysis we noted that the abnormal time was usually from 1 to 7 days before earthquakes, and the abnormal regions might appear both to the east and west of the epicenters, mostly leaning to the magnetic equator.
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    • References (22)
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