# Shear strain

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(Î³ ) (1) tangent of the angle by which a lineA, originally orthogonal to a line B, rotated with respectto B in finite deformation; (2) - tangent of theangle by which a line initial normal to the boundaryof a shear zone rotated with respect to that boundaryin finite deformation. Strain in shear zones is commonlyexpressed as shear strain. (Passchier and Trouw, 2005, Microtectonics)