Question

The Richter scale is based on measurements of the ____ of a seismic wave. (1 point) speed frequency intensity amplitude

Answer 1

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The Richter magnitude scale (often shortened to Richter scale) was developed to assign a single number to quantify the energy released during an earthquake.
The scale is a base-10 logarithmic scale. The magnitude is defined as the logarithm of the ratio of the amplitude of waves measured by a seismograph to an arbitrary small amplitude. An earthquake that measures 5.0 on the Richter scale has a shaking amplitude 10 times larger than one that measures 4.0, and corresponds to a 31.6 times larger release of energy.[1]

http://en.wikipedia.org/wiki/Richter_magnitude_scale