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How does a seismograph measure seismic waves?

April 26, 2017measure seismic seismograph waves

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How does a seismograph measure seismic waves?

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so that very small tremors are detectable. A big mechanical seismograph may have a weight attached that weighs 1,000 pounds (450 kg) or more, and it drives a set of levers that significantly magnify the pen’s motion.