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How do seismologists, or scientists who study earthquakes, know that the largest known earthquake to hit the region occurred around this time?

User Mattbawn
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Answer:

By looking at the amount of time between the P and S wave on a seismographs recorded on a seismograph, scientists can tell how far away the earthquake was from that location. However, they can't tell in what direction from the seismograph the earthquake was, only how far away it was.

Step-by-step explanation:

User Bpoiss
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