| 1. | A strong foreshock preceded the mainshock by about 20 to 25 seconds.
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| 2. | It was preceded by a strong M5.7 foreshock.
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| 3. | The earthquake lacked foreshocks that usually come with earthquakes of this magnitude.
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| 4. | The foreshock and aftershock sequence of this incident were major.
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| 5. | The earthquake was preceded by strong foreshocks on 3 and 7 November.
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| 6. | The epicenter lies just east of the October 23 foreshock.
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| 7. | He said the quake had a foreshock followed by three strong shocks.
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| 8. | The earthquake lacked the foreshocks that sometimes come with earthquakes of this magnitude.
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| 9. | A sequence of minor foreshocks preceded the main event.
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| 10. | A strong foreshock preceded the main shock by about 20 to 25 seconds.
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