  We isolate single Schallamach waves --- detachment fronts that mediate
inhomogeneous sliding between an elastomer and a hard surface --- to study
their creation and dynamics. Based on measurements of surface displacement
using high-speed \emph{in situ} imaging, we establish a Burgers vector for the
waves. The crystal dislocation analogues of nucleation stress, defect pinning
and configurational force are demonstrated. It is shown that many
experimentally observed features can be quantitatively described using a
conventional model of a dislocation line in an elastic medium. We also
highlight the evolution of nucleation features such as surface wrinkles, with
consequences for interface delamination.
