Because of low absorption of seismic wave energy in the central United States, as compared to the western part, relations between ground motion and intensity differ for the two regions. This paper presents some empirical relations between magnitude, intensity and perceptibility that are applicable to the central United States. In general, the areas of perceptibility and of damage are one to two orders greater for earthquakes in the central area than for western earthquakes of equal magnitude or of equal maximum Modified Mercalli intensity.
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Necioglu et al. (1974) studied this question.
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