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Ma Xinxin, Lin Zhan, Chen Huaran, Jin Honglin, Li Dahu, Jiao Liguo, Liu Xiaocan. 2013: Ionosphere anomaly before the Wenchuan MS8.0 earthquake detected by COSMIC occultation data. Acta Seismologica Sinica, 35(6): 848-855. DOI: 10.3969/j.issn.0253-3782.2013.06.008
Citation: Ma Xinxin, Lin Zhan, Chen Huaran, Jin Honglin, Li Dahu, Jiao Liguo, Liu Xiaocan. 2013: Ionosphere anomaly before the Wenchuan MS8.0 earthquake detected by COSMIC occultation data. Acta Seismologica Sinica, 35(6): 848-855. DOI: 10.3969/j.issn.0253-3782.2013.06.008
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Ionosphere anomaly before the Wenchuan MS8.0 earthquake detected by COSMIC occultation data

  • 1.

    Institute of Geophysics, China Earthquake Administration, Beijing 100081, China

  • 2.

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

  • 3.

    Institute of Engineering Seismology, Earthquake Administration of Sichuan Province, Chengdu 610041， China

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  • Received Date: June 14, 2012
  • Revised Date: December 05, 2012
  • Published Date: October 31, 2013
    Graphical Abstract
    • Abstract
  • By a least-squares fitting method we calculated the coefficients of spherical harmonic functions， and examined electron density in and around epicentral region of the Wenchuan MS8.0 earthquake based on COSMIC occultation data. At the same time we evaluated the maximum electron density using the principal component analysis, and deduced the temporal variation of the contribution of each principal component. It was found that the enhanced anomalous TEC disturbances over seismogenic zone took place before the Wenchuan earthquake in the layer from altitude of 300 km to 450 km, further more the disturbance changed with height. The third principal component increased significantly during 19:00—24:00 (local time) within 13—27 days (from April 15 to 29) prior to the Wenchuan earthquake. The results showed that there was a clear ionospheric anomaly before the Wenchuan earthquake. Result of this study helps us in understanding the seismic-ionospheric coupling model.
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    • References (22)
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