  We use CORSIKA+Herwig simulation code to produce ultra-high energy neutrino
interactions in the atmosphere. Our aim is to reproduce extensive air showers
originated by extragalactic tau-neutrinos. For charged current tau-neutrino
interactions in the atmosphere, beside the air shower originated from the
neutrino interaction, it is expected that a tau is created and may decay before
reaching the ground. That phenomenon makes possible the generation of two
related extensive air showers, the so called Double-Bang event. We make an
analysis of the main characteristics of Double-Bang events in the atmosphere
for mean values of the parameters involved in such phenomenon, like the
inelasticity and tau decay length. We discuss what may happen for the ``out of
the average'' cases and conclude that it may be possible to observe this kind
of event in ultra-high energy cosmic ray observatories such as Pierre Auger or
Telescope Array.
