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measure of the earthquake risk from the coefficient- a* of the N(M)-
relation normalized to a standard slope b, and a standard area. In comparing
the earthquake risk in Greece and Southern California, it was found
that the average and the maximum earthquake risk in the area of Greece
is about one half and two times, respectively, the average earthquake risk
in Southern California.
Another method is proposed for the calculation of the recurrence rates
for earthquakes of a given magnitude range in small areas for which the
existing earthquake magnitude data are not abundant and good enough for
determining a reliable recurrence curve. In view of the large fluctuation of
the actual recurrence rates for earthquakes of a given magnitude -disregarding
the accuracy of the available data — mapping in the form of the earthquake
frequency isolines seems to be meaningless for engineering purposes.
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