Inferences of deviatoric stress in actively deforming belts from simple physical models

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Authors:England, Philip; Molnar, Peter
Author Affiliations:Primary:
Oxford Univ., Dep. Earth Sci., Oxford, United Kingdom
Other:
Univ. Durham, United Kingdom
Univ. Liverpool, United Kingdom
Mass. Inst. Technol., United States
Volume Title:Tectonic stress in the lithosphere
Volume Authors:Whitmarsh, R. B., editor; Bott, M. H. P.; Fairhead, J. D.; Kusznir, N. J.
Source:Philosophical Transactions of the Royal Society of London, Series A: Mathematical and Physical Sciences, 337(1645), p.151-164; A Royal Society discussion meeting ; Tectonic stress in the lithosphere, London, United Kingdom, Apr. 10-11, 1991, edited by R. B. Whitmarsh, M. H. P. Bott, J. D. Fairhead and N. J. Kusznir. Publisher: Royal Society of London, London, United Kingdom. ISSN: 0080-4614
Publication Date:1991
Note:In English. 61 refs.; illus. incl. 1 table
Summary:Estimates of deviatoric stress in the deeper lithosphere are reviewed with a comparison of theoretical results including data on heat flow and T near major shear zones, and the distribution of strain rate and topography in zones of active continental deformation. In the deeper levels of these zones, shear stresses may be 50-100 MPa and within strike-slip zones in the lower lithosphere they may be similar to this range. The force per unit length required to deform the lithosphere in the Andes and Tibet is estimated to be approx 5 x 1012 N/m, equivalent to an average shear stress of approx 25 MPa through 100 km-thick lithosphere. In active belts deformation is determined by creep of the lower lithosphere rather than by friction on faults. Patterns of rotation of crustal blocks of western N America indicate that these blocks passively follow the deformation of a continuous substrate. [R.K.H.]
Subjects:Equations; Faults; Lithosphere; Mechanics; Mechanism; Physical models; Plate tectonics; Shear stress; Stress; Thrust faults
Abstract Numbers:92M/2334
Record ID:1992003420
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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