| Rate and acceleration of activity |
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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, I.e. |
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| the number of
events of certain size per unit time, |
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| rate of
activity. |
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| L(t | m, s,
t0) -
deviation of activity from a longer- |
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| term trend
over the period from t0 to t: |
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| L(t | m, s, t0)
= |
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| N(t
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m,s) - N(t | m,t-s-t0) ´ s/(t-s-t0) |
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| Sixth
Workshop on Non-Linear |
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| Dynamics and Earthquake Prediction |
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| The Abdus Salam ICTP, Miramare |
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| 22/10/2001 |
| 10 |