W. Brian Whalley, Cheryl F. Palmer, Samantha J. Hamilton, H. Elizabeth Martin, An Assessment of Rock Glacier Sliding Using Seventeen Years of Velocity Data: Nautárdalur Rock Glacier, North Iceland, Arctic and Alpine Research, Vol. 27, No. 4 (Nov., 1995), pp. 345-351
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Whalley et al. (1995) studied this question.