| Earthquakes occur through a sudden vibration |
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| Continents have been moving on plates |
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| When two plates meet on the ocean floor |
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| Most of the major earthquakes |
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| The magnitude of earthquakes is measured |
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| The epicenter of an earthquake is on the surface |
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| The strongest earthquake ever registered |
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| Most of San Francisco was destroyed in 1906 |
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| An earthquake in the ocean |
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| In 2011, a 9.1 earthquake in in Japan |
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