  We calculate the effect of sterile neutrinos and nonstandard neutrino
interactions on the flux of active neutrinos from the Earth's crust and mantle
taking matter effect into account in both cases. For simple Earth model and
using previous emission flux estimates at the source, we find that for
reasonable choice of parameters for both the sterile neutrino and nonstandard
interaction, the effect on the neutrino flux is a few percent or less.
