Abstract
Gumbel's extreme-value theory is used to estimate the probability of occurrence and average return periods for earthquakes in the Indian Ocean seismic belts. The nature of seismic activity, and annual and 50 year maximum magnitudes of earthquakes are also discussed. The earthquake occurrence model of autocorrelation lends support for the periodicity of the most probable earthquake in these belts. The percentage probability of recurrence of earthquakes of magnitude 8 and above has been estimated for the region mentioned.
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