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N(t½m,s) -
the number of earthquakes
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with M ≥ m in time interval from (t-s) to t,
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I.e. the
number of events of certain size per
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unit time, rate
of activity.
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A dual
function - the time that accommodates
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the most
recent n events with M ≥ m ,
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TI(t½m,n).
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