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Manuscript received June 28, 1972.

Note added in proof: In Figure 9, the actual value of the vertical component of acceleration for the 1968 Illinois earthquake was mistakenly plotted, rather than three times this quantity, as stated in the text. Thus, all the data points plotted as circles in Figure 9 should have their ordinates increased by 0.5 units.

The author is indebted to Mr. Warner Howe of Gardner and Howe, Memphis, Tennessee, for pointing out this error to him.