Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/3511
AuthorsLi, F.* 
Parrot, M.* 
TitleStudy of the TEC data obtained from the DORIS stations in relation to seismic activity
Issue DateFeb-2007
Series/Report no.1/50 (2007)
URIhttp://hdl.handle.net/2122/3511
Keywordsionosphere
seismic activity
total electron content
Subject Classification04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring 
AbstractIonospheric data obtained from the DORIS system are used in this paper. The DORIS system is composed of several ground-based beacons which emit at two frequencies (400 MHz and 2 GHz) and of receivers on board several satellites (currently SPOT2, SPOT4, SPOT5, Topex-Poseidon, Jason1 and Envisat). Thanks to the density of its network coverage (∼50 stations), DORIS provides information on the ionosphere. The TEC (Total Electron Content) parameter which is the electron density integrated over the vertical could be obtained from DORIS measurements. In a first step, the paper describes the way to obtain the TEC data from the DORIS ionospheric measurements, and comparisons of the results are done with the IRI2001 model. In a second step, TEC values are used to search for correlation between ionospheric perturbations and seismic activity. Earthquakes of magnitude larger than 5 are chosen close to the ground-based DORIS stations. Among other results, the statistics show that, during the night time and at geomagnetic latitude close to the equator (<10°), TEC amplitude fluctuates at the time of the earthquakes as it is expected, but also 2 days and 5 days before.
Appears in Collections:Annals of Geophysics

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