In this study, numerical tsunami
simulations along the Bangladesh
coast were conducted in order to make tsunami database. The numerical model is
based on the spatial grid system in Cartesian coordinate system using a
non-linear tsunami theory. Two types of bathymetry grid interval were
considered in this study such as (1) one arc minute, that is about 1850 m and
(2) twenty arc seconds that is about 616.67 m. The source points have been set
up near the Bangladesh
coast and parallel to the trench. The coastal points, forecast points and one
tide gauge station were set up near the coast. Ten source points were selected
with four different magnitudes (Mw 6.5, 7.0, 7.5 and 8.0) and four
different depths (0, 10, 20 and 30 km). Tsunami heights were checked
graphically for all cases. The Green’s Law was applied to obtain the reliable
tsunami heights along the coast from the tsunami heights at forecast points.
Results of both grid interval of bathymetry were compared with each other. The
simulation results were stored in MySQL system for a tsunami database.