  We examine the dependence of event rates at neutrino telescopes on the
neutrino-nucleon cross section for neutrinos with energy above 1 PeV, and
contrast the results with those for cosmic ray experiments. Simple scaling of
the Standard Model cross sections leaves the rates of upward events essentially
unchanged. Details, such as detector depth and cross section inelasticity, can
influence rates. Numerical estimates of upward shower, muon and tau event rates
in the IceCube detector confirm these results.
