Volume 34 Issue 6
Nov.  2014
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ZHANG Xuemin, LIU Jing, ZHAO Biqiang, XU Tong, SHEN Xuhui, YAO Lu. Analysis on Ionospheric Perturbations before Yushu Earthquake[J]. Chinese Journal of Space Science, 2014, 34(6): 822-829. doi: 10.11728/cjss2014.06.822
Citation: ZHANG Xuemin, LIU Jing, ZHAO Biqiang, XU Tong, SHEN Xuhui, YAO Lu. Analysis on Ionospheric Perturbations before Yushu Earthquake[J]. Chinese Journal of Space Science, 2014, 34(6): 822-829. doi: 10.11728/cjss2014.06.822

Analysis on Ionospheric Perturbations before Yushu Earthquake

doi: 10.11728/cjss2014.06.822
  • Received Date: 2013-11-11
  • Rev Recd Date: 2014-09-05
  • Publish Date: 2014-11-15
  • In this paper, the ionospheric perturbations in three parameters have been analyzed around Yushu earthquake, including f0F2 from ionosonde, GPS TEC, and in-situ plasma parameters by satellite. Their temporal and spatial relationship with this event were studied, and the results showed synchronous disturbances in multi-parameters on 13 April, just one day before the Yushu earthquake. The f0F2 abnormally increased 40% relative to its sliding median of 5 days before, and its anomalous center moved from southeast to southwest. GPS TEC with abnormal amplitude of 15TECU (1TECU=1016m-2) concentrated in a longitudinal scale of 15° over the south of the epicenter, and similar anomalies were found at its conjugate areas. While the in-situ observation of oxygen ion density Ni(O+) from DEMETER reached its maximum on April 13 for the four months from January to April in 2010, with the anomalies deviating to the equatorial areas but limited in the longitude scale of 30°-50°. Su mming up the anomalous characteristics in these three parameters, whatever the local feature in space, or the close relevance in time, both exhibited possible relationship with the Yushu earthquake. Combined with other observations, the seismo-ionospheric coupling mechanism was discussed during the preparation process of Yushu earthquake.

     

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