Answer the following question given this paragraph: 

Seismograms contain a lot of information about an earthquake: its strength, length, and distance. Wave height is used to determine the magnitude of the earthquake. The seismogram shows the different arrival times of the seismic waves ( Figure below ). The first waves are P-waves since they are the fastest. S-waves come in next and are usually larger than P-waves. The surface waves arrive just after the S-waves. If the earthquake has a shallow focus, the surface waves are the largest ones recorded.


Q: What measurement of the wave is used to determine the magnitude of an earthquake?

 Choices:

- length

- diameter

- width

- height

A:
height
