Seismic waves are the waves that transport energy away from the focus of an earthquake. Seismometers, such as the one shown here, measure the shaking of the Earth as a result of earthquakes. What information from seismometers do scientists use to determine the energy of an earthquake?
A. The period of the earthquake motion
B. The amplitude of the earthquake motion
C. The frequency of the earthquake motion
D. The speed at which the earthquake travels