  The ultra high energy cosmic neutrinos are powerful astrophysical probes for
both astrophysical mechanisms of particle acceleration and fundamental
interactions. They open a window into the very distant and high-energy Universe
that is difficult to access by any human means and devices. The possibility of
detecting them in large exposure space-based apparatus, like JEM-EUSO, is an
experimental challenge. In this paper we present an estimation of the
feasibility of detection of UHE tau neutrino by the JEM-EUSO telescope. The
interactions of tau-neutrino in sea water and Earth's crust have been
investigated. The estimation of the propagation length and energy of the
outgoing tau-lepton shows that if its decay occurs in the atmosphere close
enough to the Earth's surface, e.g. below $\sim$ $5 km$ altitude, the cascade
is intensive enough and the generated light can be detected from space. We have
evaluated the geometrical aperture of the JEM-EUSO detector for the
Earth-skimming (horizontal and upward-going) tau-neutrinos by making specific
modifications to the standard CORSIKA code and developing an interface to the
existing ESAF (EUSO Simulation and Analysis Framework) software.
