Abstract
ACCORDING to the modified Lomnitz law of imperfect elasticity, the response to a constant stress contains a term in tα. I have pointed out1 that in a vibration, according to this law, besides the damping of vibrations, there is a delay proportional to (period)α; this would be small for the S waves that I was considering. If, however, l/Q is the damping factor as usually defined, the delay lengthens the period by a factor (l/Q) cot ½πα. For the slowest free vibration of the Earth as a whole Q appears to be about 400; with α = ¼, as I have suggested, the factor would be about 1/160.
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