S U M M A R YT h e problem of aftershock identification in earthquake catalogues is studied. Some empirical methods are considered and quantitavely analysed.Game theory approach is applied t o formulate the problem allowing a whole class of optimal methods of aftershock identification. Each method is optimal depending on the goals and gives the best trade-off between the number of missed aftershocks and the number of incorrectly identified ones. Some illustrations of the new approach to the aftershock identification problem are presented.
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