Articles | Volume 11, issue 4
Nat. Hazards Earth Syst. Sci., 11, 1083–1089, 2011
https://doi.org/10.5194/nhess-11-1083-2011

Special issue: Progress in research on earthquake precursors

Nat. Hazards Earth Syst. Sci., 11, 1083–1089, 2011
https://doi.org/10.5194/nhess-11-1083-2011

Brief communication 11 Apr 2011

Brief communication | 11 Apr 2011

Brief communication "Monitoring ionospheric variations before earthquakes using the vertical and oblique sounding network over China"

T. Xu1, J. Wu1, Z. Zhao1, Y. Liu1, S. He1, J. Li1, Z. Wu2, and Y. Hu1 T. Xu et al.
  • 1National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation (CRIRP), Qingdao, 266107, China
  • 2School of Science, Xidian University, Xi'an, 710071, China

Abstract. The problem of earthquake prediction has stimulated the research for correlation between seismic activity and ionospheric anomaly. Many observations have shown the existence of anomaly of critical frequency of ionospheric F-region, foF2, before earthquake onset. Ionospheric sounding has been conducted routinely for more than 60 years in China by the China Research Institute of Radiowave Propagation (CRIRP), and deveoloped a very powerful ability to observe the ionosphere. In this paper, we briefly describe the anomalous variation of the foF2 before Ms8.0 Wenchuan earthquake (occurred on 12 May 2008 at 14:28 LT; 31.00° N, 103.40° E), which is a sign of the great interest arising in the seismo-ionospheric investigation of Chinese researchers. Furthermore, we introduce the routine work on seismo-ionospheric anomaly by the ground based high-resolution ionospheric observation (GBHIO) network comprising 5 vertical and 20 oblique sounding stations.

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