Most works on geophysics assume laws of damping according to which the creep under constant stress would be proportional to the time or to its logarithm. Both contradict strong geophysical evidence. The most direct evidence indicates that creep under small stresses increases about like t0.2. This rule is tested by application to several geophysical and astronomical phenomena and leads to satisfactory explanations. The data, however, concern average properties of the Earth's shell and attention is needed to possible variation of the properties with depth.
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H. Jeffreys (1975) studied this question.
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