GPS Solutions

, Volume 14, Issue 1, pp 83–89 | Cite as

Seismo-ionospheric precursor of the 2008 Mw7.9 Wenchuan earthquake observed by FORMOSAT-3/COSMIC

  • Chun-Chieh Hsiao
  • J. Y. Liu
  • K.-I. Oyama
  • N. L. Yen
  • Y. A. Liou
  • S. S. Chen
  • J. J. Miau
Original Article

Abstract

The seismo-ionospheric precursor prior to the Mw7.9 earthquake near Wenchuan, China, on 12 May 2008 was observed by the FORMOSAT-3/COSMIC satellite constellation. By binning radio occultation observations, the three-dimensional ionospheric structure can be obtained to monitor the ionospheric electron density variation prior to the earthquake. It has been determined that near the epicenter the F2-peak height, hmF2, descends about 25 km and the F2-peak electron density, NmF2, decreases about 2 × 105 el/cm3 around noon within 5 days prior to the earthquake. The integrated electron content decreases more than 2 TECU between 250 and 300 km altitude.

Keywords

FORMOSAT3/COSMIC Ionosphere Earthquake Satellite GPS Radio occultation 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Chun-Chieh Hsiao
    • 1
  • J. Y. Liu
    • 2
    • 3
  • K.-I. Oyama
    • 2
  • N. L. Yen
    • 1
  • Y. A. Liou
    • 2
    • 3
  • S. S. Chen
    • 1
  • J. J. Miau
    • 1
  1. 1.National Space OrganizationHsin-ChuTaiwan
  2. 2.Institute of Space ScienceNational Central UniversityChung-LiTaiwan
  3. 3.Center for Space and Remote Sensing ResearchNational Central UniversityChung-LiTaiwan

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