  We propose a decay signature for non-thermal small black holes with masses in
the TeV range which can be discovered by neutrino observatories. The black
holes would result due to the impact between ultra high energy neutrinos with
nuclei in water or ice and decay instantaneously. They could be produced if the
Planck scale is in the few TeV region and the highly energetic fluxes are large
enough. Having masses close to the Planck scale, the typical decay mode for
these black holes is into two particles emitted back-to-back. For a certain
range of angles between the emitted particles and the center of mass direction
of motion, it is possible for the detectors to measure separate muons having
specific energies and their trajectories oriented at a large enough angle to
prove that they are the result of a back-to-back decay event.
