  Many proposed and upcoming experiments seek to observe signals from upward
going air showers initiated by tau leptons resulting from neutrino interactions
inside the Earth. To save calculation time, event estimations for these
observation methods are usually performed while making several assumptions
about the showers themselves, which simplifies their rich phenomenology and may
or may not lead to inaccuracies in results. Here, we present results of
extensive CORSIKA simulations of upward going tau initiated showers in the
energy range 1 PeV to 10 EeV. Specifically, we monitor the Cherenkov emission,
the charged particle distributions, and the timing of the showers for different
geometric configurations. We analyze the impact of the decay length and
different decay modes of the tau on particle distributions and compare to
primaries usually utilized to simulate a tau shower, such as gammas, electrons,
and protons. We also check the accuracy of many of the usual assumptions of
these showers and analyze the often ignored muon channel of the tau decay.
