  The ANITA balloon experiment has recently observed several ~EeV cascade
events at an angle below the horizon that renders any Standard Model (SM)
interpretation unlikely as the Earth is significantly opaque to all SM
particles at such energies. In this paper, we study a sterile neutrino
interpretation of these events, calculating the angular acceptance of cascades
and the relative sensitivities of several experiments to a cascade initiated by
an EeV sterile neutrino. We find that ANITA is uniquely sensitive to this type
of upward directed cascade signal over a wide portion of the sky and from the
direction of the two observed events has a transient acceptance roughly
equivalent to that of the IceCube experiment.
