National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Statistical Study of the Ionospheric Density Variation Related to the 2010 Chile Earthquake and Measured by the DEMETER Satellite
Píša, David ; Santolík, Ondřej ; Parrot, M.
Statistical Study of the Ionospheric Density Variation Related to the 2010 Chile Earthquake and Measured by the DEMETER Satellite.
Možný vliv zemětřesení na nízkofrekvenční elektromagnetické vlny: pozorování na družici s nízkou orbitou
Němec, František ; Santolík, Ondřej ; Parrot, M.
We present results of a statistical study of VLF (up to 10 kHz) wave intensity measured by a low-altitude spacecraft in the vicinity of earthquakes. The data from the French DEMETER spacecraft (altitude about 700 km, nearly Sun-synchronous orbit) that was specially developed for such kind of studies are used. The recently developed two-step data processing method is briefly introduced and the main obtained results are reviewed. Finally, a simple independent test of the obtained results is done in order to give an additional evidence for the existence of possible seismic-related effect. Our results indicate that there is a decrease of power spectral density of electric field fluctuations shortly (0-4 hours) before the time of the main shock. This decrease was observed close to surface earthquakes (depth less than 40 km) with magnitude larger than or equal to 4.8 and only during the night. No similar effect was observed for deep earthquakes nor during the day.

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