Acta Geodaetica et Cartographica Sinica >

2016 , Vol. 45 >Issue S2: 139 - 146

DOI: https://doi.org/10.11947/j.AGCS.2016.F035

Ionospheric Anomaly before Kyushu|Japan Earthquake

  • YANG Li ,
  • ZHAO Haishan ,
  • DONG Ming ,
  • Xu Shiy ,
  • NAN Tianhao
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  • 1. Information Engineering University, Zhengzhou 450001, China;
    2. BeiDou Navigation Technology Collaborative Innovation Center of Henan, Zhengzhou 450001, China;
    3. Satellite Navigation Engineering Center, Beijing 100000, China;
    4. Fourth Detachment of Armed Forces of Gold, Liaoyang 111000, China

Received date: 2016-11-25

  Revised date: 2016-12-20

  Online published: 2017-05-20

Supported by

Geo-information Ergineering State Key Laboratory Open Fund(No.SKLJIE2014-Z-2-1)

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Abstract

GIM data released by IGS is used in the article and a new method of combining the Sliding Time Window Method and the Ionospheric TEC correlation analysis method of adjacent grid points is proposed to study the relationship between pre-earthquake ionospheric anomalies and earthquake. By analyzing the abnormal change of TEC in the 5 grid points around the seismic region, the abnormal change of ionospheric TEC is found before the earthquake and the correlation between the TEC sequences of lattice points is significantly affected by earthquake. Based on the analysis of the spatial distribution of TEC anomaly, anomalies of 6 h, 12 h and 6 h were found near the epicenter three days before the earthquake. Finally, ionospheric tomographic technology is used to do tomographic inversion on electron density. And the distribution of the electron density in the ionospheric anomaly is further analyzed.

Key words： ionospheric anomaly; sliding window method; correlation analysis; geomagnetic indices; solar activity index; Ionospheric tomography

Cite this article

YANG Li , ZHAO Haishan , DONG Ming , Xu Shiy , NAN Tianhao . Ionospheric Anomaly before Kyushu|Japan Earthquake[J]. Acta Geodaetica et Cartographica Sinica, 2016 , 45(S2) : 139 -146 . DOI: 10.11947/j.AGCS.2016.F035

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