GPS Solutions

, Volume 14, Issue 1, pp 83–89

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

Authors

    • National Space Organization
  • J. Y. Liu
    • Institute of Space ScienceNational Central University
    • Center for Space and Remote Sensing ResearchNational Central University
  • K.-I. Oyama
    • Institute of Space ScienceNational Central University
  • N. L. Yen
    • National Space Organization
  • Y. A. Liou
    • Institute of Space ScienceNational Central University
    • Center for Space and Remote Sensing ResearchNational Central University
  • S. S. Chen
    • National Space Organization
  • J. J. Miau
    • National Space Organization
Original Article

DOI: 10.1007/s10291-009-0129-0

Cite this article as:
Hsiao, C., Liu, J.Y., Oyama, K. et al. GPS Solut (2010) 14: 83. doi:10.1007/s10291-009-0129-0

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/COSMICIonosphereEarthquakeSatelliteGPSRadio occultation

Copyright information

© Springer-Verlag 2009