| What are earthquakes |
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| l | Earthquake is
defined as |
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| vibrations of
the Earth’s crust |
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| when rocks
suddenly rupture. |
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| l | Although
historical records on |
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| earthquakes
are known from 2100 |
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| B.C., most of
them before the |
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| middle of the
18th century are |
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| generally
lacking or not reliable. |
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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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| 15/10/2001 |
| 3 |