  Strains in superconductors due to moving vortices and vortex lattices are
discussed. It is shown that the energy stored in elastic strains increases with
vortex velocity. For moving vortex lattices, the elastic energy depends on
velocity orientation relative to the lattice having minimum for the velocity
directed along one of the unit cell vectors of the moving lattice. It is shown
that for supersonic motion, the vortex induced stress field has a shape similar
to supersonic shock waves.
