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Geological Society, London, Special Publications; 1981; v. 9; p. 33-39;
DOI: 10.1144/GSL.SP.1981.009.01.04
© 1981 Geological Society of London

I. Mechanics of Thrusts and Nappes

Pore pressure, discontinuities, isostasy and overthrusts

P. E. Gretener

Department of Geology, The University of Calgary, Calgary, Alberta, Canada, T2N 1N4

Thrusting represents the shifting of large loads. This has the following consequences: (a) in the overridden sequence high pore pressures develop initially due to rapid loading and later due to aquathermal pressuring caused by slower thermal adjustment. This leads to the activation of deeper and more outward emerging thrust planes: (b) the isostatic response to the loading in front and the simultaneous unloading in the back produces the wandering bulge.

These two processes tend to make thrust faulting a self-perpetuating process once it has been initiated.