Accurate numerical simulation of the far-field tsunami caused by the 2011 Tohoku earthquake, including the effects of Boussinesq dispersion, seawater density stratification, elastic loading, and gravitational potential change

•Accurate far-field tsunami simulation with a finite difference scheme.•Consideration of Boussinesq dispersion and water density stratification.•Consideration of elastic loading and gravitational potential change.•Tsunami computation using a high-performance computer.