Kinematic interpretation of shearband boudins: New parameters and ratios useful in HT simple shear zones

► New geometric parameters to shearband boudins: Bbs, B-t, c′, D′, d, ψ′. ► The identification of a local displacement plane (Sx), which is always normal to the boudin axis (Lb). ► New methodology to the kinematic interpretation of shearband boudins, in HT simple shear zones, using the Bbs orientation, c′ type-I kinematics and the relative position of B-t and Bbs.