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If the ultrahigh-energy (UHE) neutrino fluxes produced from a distantastrophysical source can be measured at a km^3-size neutrino telescope, theywill provide a promising way to help determine the flavor mixing pattern ofthree active neutrinos. Considering the conventional UHE neutrino source withthe flavor ratio \phi_e : \phi_\mu : \phi_\tau = 1 : 2 : 0, I show that\phi^D_e : \phi^D_\mu : \phi^D_\tau = (1 -2 \Delta) : (1 +\Delta) : (1 +\Delta)holds at the detector of a neutrino telescope, where \Delta characterizes theeffect of \mu-\tau symmetry breaking (i.e., \theta_13 \neq 0 and \theta_23 \neq\pi/4). Current experimental data yield -0.1 \leq \Delta \leq +0.1. It is alsopossible to probe \Delta by detecting the \bar{\nu}_e flux of E_\bar{\nu}_e\approx 6.3 PeV via the Glashow resonance channel \bar{\nu}_e e \to W^- \toanything. Finally, I give some brief comments on the possibility to constrainthe mixing between active and sterile neutrinos by using the UHE neutrinotelescopes.

Neutrino telescopes as a probe of active and sterile neutrino mixings