Gravity induced near-surface stresses in long-symmetric ridge-valley systems |
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Authors: | P Mandal R N Singh |
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Institution: | (1) National Geophysical Research Institute, 500 007 Hyderabad, India |
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Abstract: | Patterns of near-surface gravity and tectonically-induced stresses within ridge-valley systems greatly illuminate our understanding
of important geodynamic processes as well as design of experiments to elucidate them. This paper presents analytical results
derived for a number of geometrical configurations and range of mechanical properties of a ridge-valley system using the elastic
solution of McTigue and Mei. The study reveals (i) the presence of non-zero compressive stresses near the ridge crests, which
decrease with increasing Poisson's ratio (μ) and reduce to zero at ridge crests for μ=0·5 and that (ii) the central tensional
regime characterizing a valley becomes narrower due to the presence of two ridges; and decreases with increasing μ, becoming
compressive at depth. For all geometrical parameters considered, all components of stress show concentration at the outer
flanks of the ridges and increase with depth approaching a standard state of stress. |
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Keywords: | Stresses ridge-valley topography |
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