| The time between the last foreshock and the mainshock varies somewhat, but is typically less than a day. |
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| These maps graphically illustrate the change in earthquake probability during aftershock and possible foreshock sequences. |
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| Even in areas where foreshocks are fairly common, there is no way of distinguishing a foreshock from an independent earthquake. |
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| A magnitude 6.7 temblor on Oct. 23 is now considered a foreshock. |
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| That foreshock, which had a magnitude above 7.0, was the longest earthquake I had ever experienced, and wasn't yet the Big One. |
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| Even if a foreshock occurs, there is no means to identify whether it is actually a aACAyforeshock' and that a major quake will follow. |
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| Figure 4 shows that the 1993 focal depth started with more than 10 km for foreshocks, no foreshock having less than 10 km depth. |
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| The foreshock sent people scrambling, and the main shock arrived with such fury that it flattened crowded rooming houses. |
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| More than 100 aftershocks followed until the bigger quake on Saturday morning, which led to the earlier, smaller event being reclassified as a foreshock. |
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| The council is supposed to make such warnings possible. The nearest that it has got to predicting a big tremor was in 1983 when a foreshock pointed a finger at a subsequent magnitude 7.7 earthquake within the Sea of Japan. |
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| Or was it a foreshock to a presumably an even bigger earthquake? |
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