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John Winthrop was the first person to study earthquakes. He is known as the creator of seismology.
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David Milne was the first person to come up with the seismograph, a machine that measures the seismic activity.
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Giuseppe Mercalli, made the first seismograph. Since it wasn't very accurate, they made it a device that measures how much damage a earthquake could do.
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Charles Richter made the first accurate seismograph known as the Richter Scale to determine an earthquake's magnitude.