Abstract
Tsunamis generated by sea bottom movement due to earthquakes are described from several viewpoints of phenomena and analysis. The initial profile is not always uniquely estimated, because fault parameters of an earthquake are not uniquely determined, and because there is a possibility of sea bottom movement which is not directly related to fault parameters. Basic equations in numerical simulation are switched from the linear theory in deep sea to higher order theories in shallow sea and on land. Several criteria other than the CFL condition are necessary to keep stability and accuracy of numerical simulation. Although runup heights numerically obtained are considered accurate enough for practical application, other properties such as wave profile, current velocity, wave pressure and so on are not yet satisfactorily solved. The 1983 Nihonkai-Chubu earthquake tsunami revealed many different faces, to edge waves for which there is no theory applicable.
