A simple algorithm for the rapid, exact computation of the attenuation factors of the torsional free modes has been developed. The calculations for torsional modes of radial order numbers from 1 to 10 and angular order numbers up to 300 show that, for periods shorter than 120 sec, the attenuation factor (but not Q) is approximately independent of radial order number j for angular order number v less than about 20. For low angular order numbers, and j > 1, both the period and attenuation factor are roughly independent of angular order number for a given j.

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