what is seismograph? How do the magnitude of earthquake is measured?
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A seismometer is an instrument that responds to ground motions, such as caused by earthquakes, volcanic eruptions, and explosions. Seismometers are usually combined with a timing device and a recording device to form a seismograph.
The Richter magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs.
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