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Crustal stress and strain patterns in the Indian plate interior: implications for the deformation behaviour of a stable continent and its seismicity
Author(s) -
Mohanty Saradaprasad
Publication year - 2011
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1111/j.1365-3121.2011.01027.x
Subject(s) - geology , induced seismicity , seismology , deformation (meteorology) , shear (geology) , shear stress , principal stress , slip (aerodynamics) , strain rate , plate tectonics , petrology , materials science , composite material , tectonics , oceanography , physics , thermodynamics
Terra Nova, 23, 407–415, 2011 Abstract The present analyses indicate that the maximum principal stress axis of the Indian plate interior does not coincide with the plate motion vector. The strain rate curves for the Indian plate indicate interference of two different orders of deformation. The magnitudes of the first‐order maximum strain rates are lower than local extreme strain rates of the second‐order deformation. It has been shown herein that the oblique motion of the Indian plate with respect to a state of dominant strike‐slip deformation in the Indian plate interior is partitioned into a principal deformation zone, synthetic shear and antithetic shear. The strain rates along these regional shear zones show complex association of second‐order high shortening rate coinciding with high extension rate. The earthquakes of the Indian plate interior are interpreted to be results of periodic accumulation of stress/strain due to shortening and release of strain along the same directions during the extension.