Intensity
A subjective measure of the force of an earthquake at a particular place as determined by its effects on persons, structures, and earth materials. Intensity is a measure of effects as contrasted with magnitude, which is a measure of energy. The principal scale used in the U.S. today is the Modified Mercalli, 1956 version.
Isoseismals
Map contours drawn to define limits of estimated intensity of shaking for a given earthquake.
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