Seismo-ionospheric precursor of the 2008 Mw7.9 Wenchuan earthquake observed by FORMOSAT-3/COSMIC |
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| Authors: | Chun-Chieh Hsiao J Y Liu K-I Oyama N L Yen Y A Liou S S Chen J J Miau |
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| Institution: | (1) National Space Organization, Hsin-Chu, Taiwan;(2) Institute of Space Science, National Central University, Chung-Li, Taiwan;(3) Center for Space and Remote Sensing Research, National Central University, Chung-Li, Taiwan |
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| 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. |
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