Abstract
Abstract Using the Total Electron Content (TEC) data recorded by the GPS receiver network, installed under the GPS and Geo Augmented Navigation (GAGAN) program, ionospheric electron content on the day of the great Sumatra-Andaman earthquake of December 26, 2004 was examined. A significant perturbation of 1.5 to 2 TEC units over a smooth variation of TEC in the morning hours was observed within 45 minutes of the quake at stations situated near the east coast of the Indian subcontinent. The disturbance was found to propagate northwestward with its origin situated about 2° northeast of the quake epicenter. Possible coupling mechanism of the crustal movement and the ionosphere are discussed.
Highlights
3. Results The STEC over the whole day of December 26, 2004, for all visible Global Positioning System (GPS) satellites at elevation angles above 15◦ are available for the stations- Vishakhapatnam (17.72◦N, 83.22◦E), Kolkata (22.64◦N, 88.44◦E), Aizwal (23.83◦N, 92.62◦E), Raipur (21.18◦N, 81.73◦E), Hyderabad (17.44◦N, 78.47◦E), Bagdogra (26.68◦N, 88.32◦E), Guwahati (26.12◦N, 91.59◦E), Mumbai (19.09◦N, 72.85◦E), Bangalore (12.95◦N, 76.68◦E), Trivandrum (8.47◦N, 76.91◦E) and Agatti (10.23◦N, 72.18◦E)
On December 26, 2004, at 00:58:53 UT, a strong earthquake (Mw = 9.15) originated in the Indian Ocean just north of Simeulue island, off the western coast of northern Sumatra, Indonesia (Park et al, 2005)
The STEC over the whole day of December 26, 2004, for all visible Global Positioning System (GPS) satellites at elevation angles above 15◦ are available for the stations- Vishakhapatnam (17.72◦N, 83.22◦E), Kolkata (22.64◦N, 88.44◦E), Aizwal (23.83◦N, 92.62◦E), Raipur (21.18◦N, 81.73◦E), Hyderabad (17.44◦N, 78.47◦E), Bagdogra (26.68◦N, 88.32◦E), Guwahati (26.12◦N, 91.59◦E), Mumbai (19.09◦N, 72.85◦E), Bangalore (12.95◦N, 76.68◦E), Trivandrum (8.47◦N, 76.91◦E) and Agatti (10.23◦N, 72.18◦E)
Summary
3. Results The STEC over the whole day of December 26, 2004, for all visible GPS satellites at elevation angles above 15◦ are available for the stations- Vishakhapatnam (17.72◦N, 83.22◦E), Kolkata (22.64◦N, 88.44◦E), Aizwal (23.83◦N, 92.62◦E), Raipur (21.18◦N, 81.73◦E), Hyderabad (17.44◦N, 78.47◦E), Bagdogra (26.68◦N, 88.32◦E), Guwahati (26.12◦N, 91.59◦E), Mumbai (19.09◦N, 72.85◦E), Bangalore (12.95◦N, 76.68◦E), Trivandrum (8.47◦N, 76.91◦E) and Agatti (10.23◦N, 72.18◦E). Vishakhapatnam, Kolkata, Aizwal, Hyderabad, Raipur, Bagdogra and Guwahati recorded prominent purturbations of STEC on four different satellites (Sv3, Sv13, Sv19 and Sv23) links in the morning hours around 1:36–1:45 UT for December 26, 2004, nearly one hour after the earthquake.
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