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Ionospheric parameter; Kleckzek index; sudden ionospheric disturbance.

With time, ionospheric variation analysis is gaining over lithospheric monitoring in serving precursors for earthquake forecast. The current paper highlights the association of major (Ms ≥ 6.0) and medium (4.0 ≤ Ms > 6.0) earthquake occurrences throughout the world in different ranges of the Ionospheric Earthquake Parameter (IEP) where ‘Ms’ is earthquake magnitude on the Richter scale. From statistical and graphical analyses, it is concluded that the probability of earthquake occurrence is maximum when the defined parameter lies within the range of 0–75 (lower range). In the higher ranges, earthquake occurrence probability gradually decreases. A probable explanation is also suggested.

D Ghosh¹ S K Midya^{1 2}

1. Department of Atmospheric Science, University of Calcutta, Kolkata 700 009, India.
2. Indian Centre for Space Physics, 43 Chalantika, Garia Station Road, Kolkata 700 084, India.

Published

February 2014

Manuscript received

1 February 2012

Manuscript revised

22 April 2013

Accepted

1 June 2013