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Learn what a seismograph is, how it works, and how it records earthquakes. Find out how seismographs help locate earthquakes and see an example of a seismogram. Learn how seismic instruments record the motion of the ground during an earthquake and how they differ from each other. Find out how earthquakes are measured, located, and classified by magnitude and intensity scales. Seismograph is another Greek term from seismós and γράφω, gráphō, to draw. It is often used to mean seismometer, though it is more applicable to the older instruments in which the measuring and recording of ground motion were combined, than to modern systems, in which these functions are separated. What is a seismograph and how does it work? A seismograph is an instrument which uses a seismometer to detect, measure and record ground movements caused by seismic phenomena, such as earthquakes.
