What does a seismograph record

Answer 1

A seismograph records seismic waves, which are vibrations or tremors in the Earth's crust caused by natural or human-induced events such as earthquakes, volcanic eruptions, or underground explosions. The seismograph's sensors or seismometers detect the ground motion caused by these seismic waves and generate a graphical representation called a seismogram. Seismograms show the intensity, duration, and frequency content of the seismic waves, providing valuable information about the source and characteristics of the seismic event.