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{{#category_index:I|intensity}} 1. The rate of flow of wave energy through a unit area perpendicular to the direction of wave travel. For a seismic wave, intensity is proportional to the square of the amplitude of displacement or velocity. 2. A measurement of the effects of an earthquake at a particular place; a measurement of the amount of shaking. The intensity depends not only upon the strength of the earthquake (earthquake magnitude) but also upon the distance from the epicenter, the local geology at the point, the nature of the surface materials, the construction of buildings, etc. See intensity scale and Figure M-9. 3. Often refers to electric or magnetic field strength; see electric field and magnetic field.