Variations of the ionospheric electron density during the Bhuj seismic event

Details Variations of the ionospheric electron density during the Bhuj seismic event Variations of the ionospheric electron density during the Bhuj seismic event

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004angeo..22.4123t&link_type=abstract

Annales Geophysicae, vol. 22, Issue 12, pp.4123-4131

Computer Science

Sound

27

Scientific paper

Ionospheric perturbations by natural geophysical activity, such as volcanic eruptions and earthquakes, have been studied since the great Alaskan earthquake in 1964. Measurements made from the ground show a variation of the critical frequency of the ionosphere layers before and after the shock. In this paper, we present an experimental investigation of the electron density variations around the time of the Bhuj earthquake in Gujarat, India. Several experiments have been used to survey the ionosphere. Measurements of fluctuations in the integrated electron density or TEC (Total Electron Content) between three satellites (TOPEX-POSEIDON, SPOT2, SPOT4) and the ground have been done using the DORIS beacons. TEC has been also evaluated from a ground-based station using GPS satellites, and finally, ionospheric data from a classical ionospheric sounder located close to the earthquake epicenter are utilized. Anomalous electron density variations are detected both in day and night times before the quake. The generation mechanism of these perturbations is explained by a modification of the electric field in the global electric circuit induced during the earthquake preparation.

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