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We report on our study of two-flavor full QCD on anisotropic lattices using$O(a)$-improved Wilson quarks coupled with an RG-improved glue. The bare gaugeand quark anisotropies corresponding to the renormalized anisotropy$\xi=a_s/a_t = 2$ are determined as functions of $\beta$ and $\kappa$, whichcovers the region of spatial lattice spacings $a_s\approx 0.28$--0.16 fm and$m_{PS}/m_V\approx 0.6$--0.9. The calibrations of the bare anisotropies areperformed with the Wilson loop and the meson dispersion relation at 4 latticecutoffs and 5--6 quark masses. Using the calibration results we calculate themeson mass spectrum and the Sommer scale $r_0$. We confirm that the values of$r_0$ calculated for the calibration using pseudo scalar and vector mesonenergy momentum dispersion relation coincide in the continuum limit withinerrors. This work serves to lay ground toward studies of heavy quark systemsand thermodynamics of QCD including the extraction of the equation of state inthe continuum limit using Wilson-type quark actions.Comment: 16 pages, 23 figures, Version accepted for publication in Physical  Review

Two flavors of dynamical quarks on anisotropic lattices