  We analyze 3D numerical simulations of driven incompressible
magnetohydrodynamic (MHD) turbulence in a periodic box threaded by a moderately
strong external magnetic field. We sum over nonlinear interactions within
Fourier wavebands and find that the time scale for the energy cascade is
consistent with the Goldreich-Sridhar model of strong MHD turbulence. Using
higher order longitudinal structure functions we show that the turbulent
motions in the plane perpendicular to the local mean magnetic field are similar
to ordinary hydrodynamic turbulence while motions parallel to the field are
consistent with a scaling correction which arises from the eddy anisotropy. We
present the structure tensor describing velocity statistics of Alfvenic and
pseudo-Alfvenic turbulence. Finally, we confirm that an imbalance of energy
moving up and down magnetic field lines leads to a slow decay of turbulent
motions and speculate that this imbalance is common in the interstellar medium
where injection of energy is intermittent both in time and space.
