A seismograph measures how violent the earthquakes are. They have a pen hanging from the top and some paper rolled onto something like a tape on the bottom. When the earth shakes the pen moves.
A seismograph measures the vibrations made when earth layers "move", such as the waves of movement during an earthquake.Frequency and amplitude of seismic waves.
Earthquakes are measured using a recording device called a seismograph. We often think of seismographs as a free-swinging pen suspended over a rotating drum of paper; modern seismographs are entirely...