Unusual ionospheric variations before the strong Auckland Islands, New Zealand earthquake of 30th September, 2007
Ibanga, J., Akpan, A., George, N., Ekanem, A., George, A. (2018). Unusual ionospheric variations before the strong Auckland Islands, New Zealand earthquake of 30th September, 2007. EKB Journal Management System, 7(1), 149-154. doi: 10.1016/j.nrjag.2017.12.007
J.I. Ibanga; A.E. Akpan; N.J. George; A.M. Ekanem; A.M. George. "Unusual ionospheric variations before the strong Auckland Islands, New Zealand earthquake of 30th September, 2007". EKB Journal Management System, 7, 1, 2018, 149-154. doi: 10.1016/j.nrjag.2017.12.007
Ibanga, J., Akpan, A., George, N., Ekanem, A., George, A. (2018). 'Unusual ionospheric variations before the strong Auckland Islands, New Zealand earthquake of 30th September, 2007', EKB Journal Management System, 7(1), pp. 149-154. doi: 10.1016/j.nrjag.2017.12.007
Ibanga, J., Akpan, A., George, N., Ekanem, A., George, A. Unusual ionospheric variations before the strong Auckland Islands, New Zealand earthquake of 30th September, 2007. EKB Journal Management System, 2018; 7(1): 149-154. doi: 10.1016/j.nrjag.2017.12.007

Unusual ionospheric variations before the strong Auckland Islands, New Zealand earthquake of 30th September, 2007

NRIAG Journal of Astronomy and Geophysics
Volume 7, Issue 1, June 2018, Pages 149-154    PDF (1021 K)
DOI: 10.1016/j.nrjag.2017.12.007
Authors
J.I. Ibanga; A.E. Akpan; N.J. George; A.M. Ekanem; A.M. George
Abstract
Using the IAP experiment on board, the DEMETER and TEC from GPS data, unusual ionospheric variations have been observed some days before the 7.4 magnitude New Zealand earthquake. Both sets of data recorded perturbations 10 days before the earthquake at about the same time. The total ion density per centimeter cube (cm), recorded a variation of 6.94 while the differential total electron content (DTEC) in total electron content unit 10 electron per metre square gave a value of 2.93TECU. The observed anomalies were screened for false alarm using the geomagnetic indices of Kernnifzer digit (Kp) and disturbance storm time (Dst.) It was however seen that the state of the ionosphere was geomagnetically quiet during this period; hence the observed variations were seismogenic.
Keywords
Demeter; Earthquakes and variations
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