Empirical equations are derived which relate maximum acceleration, velocity, and displacement computed from strong motion earthquake records to magnitude and distance from source to site. Over fifty earthquakes recorded at three California sites were used in the study. The equations show that earthquake magnitude governs not only the character of response spectra but also the characteristic period content of the earthquake. As an added feature, the reported Modified Mercalli intensities are shown to correlate best with computed response spectra which include only the low period range.

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