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A seismograph is a scientific instrument which records information about the duration, intensity, and direction of a seismic disturbance, classically an earthquake. In addition to registering earthquakes, seismographs can also track large explosions, tidal waves, and other events which cause the ground to shake. These devices are used to gather more information about seismic disturbances, and to monitor the earth for early warning signs of seismic events. Properly, a seismograph should ... Seismograph - Earthquake Detection, Monitoring, & Analysis: A seismograph records oscillation of the ground caused by seismic waves that travel from their point of origin through Earth or along its surface. The seismogram of a nearby small earthquake has a simple pattern, showing the arrival of P waves (longitudinal waves, which vibrate in the direction of propagation), S waves (transverse waves—that is, waves that vibrate at right angles to the direction of propagation), and surface waves ... 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.
