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Ionospheric perturbations observed by the GPS following the December 26th, 2004 Sumatra-Andaman earthquake

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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.

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Correspondence to Ashish DasGupta.

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DasGupta, A., Das, A., Hui, D. et al. Ionospheric perturbations observed by the GPS following the December 26th, 2004 Sumatra-Andaman earthquake. Earth Planet Sp 58, 167–172 (2006) doi:10.1186/BF03353374

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Key words

  • Earthquake
  • tsunami
  • ionospheric response
  • atmospheric gravity wave
  • Total Electron Content
  • seismoelectric effect