The graph on which seismic waves are recorded is called a seismogram. The amplitude of the recorded seismic wave is the vertical distance between the crest and trough of the waveform, therefore, the larger the earthquake, the greater the amplitude of the earthquake. Write down the important facts about the earthquake. Magnitude and intensity Earthquakes are categorized in two ways- magnitude and intensity. Magnitude indicates the severity of an earthquake using the Richter Scale, a logarithmic, instrumentally determined measurement.
Magnitude rates an earthquake as a whole.
The severity of an earthquake is a rating based on the amplitude of the seismic waves. Larger amplitude waves equals higher magnitude earthquake equals greater severity. The Mercalli Scale defines intensity. Intensity is rated by how much damage was caused by an earthquake and how it affected people. Go to the University of Nevada-Reno Richter scale page for an excellent explanation of the Richter Scale and other earthquake quantifying tools.