Abstract
The mesh size and time increment, other than the CFL condition, essential to obtain tsunami run-ups with sufficient accuracy for practical applications are examined. It is found that more than 20 spatial grid points should be included within a local wave length for obtaining reasonable wave heights. This criterion is applied to a numerical simulation of the Nihonkai-Chubu earthquake tsunami in 1983, the measured run-up heights and inundated areas of which supply plentiful data for comparison. The present computation reproduced very well the spatial distribution of tsunami run-ups and those maximum values.
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