Question

multiple choice question
magnitude is measured on the richter scale using differences in
speed of the seismic waves.
amplitude of seismic waves.
intensity of the seismic waves.

Explanation:

The Richter scale measures the magnitude of an earthquake based on the amplitude of seismic waves recorded by seismographs. The intensity of seismic waves is measured by the Mercalli scale. The speed of seismic waves is related to the properties of the medium they travel through (like rock type in the Earth) and is not what the Richter scale uses.

Answer:

amplitude of seismic waves.