🌊 Tsunami Travel Time: How Fast a Tsunami Crosses the Ocean, Shoals and Reaches the Shore

Interactive 3D ocean basin showing how a tsunami travels from a seabed uplift to a generic coast: wave speed c = sqrt(g h) (about 700 km/h at 4 km depth), arrival-time isochrones, wavelength shortening and Green's law amplification on the continental shelf, and a run-up estimate. Change magnitude, uplift, source depth and shelf slope; travel times and Green's law are checked against theory. Linear shallow-water model, educational, not a forecast.