An ammunition ship carrying explosives equivalent to 2900 tons of TNT blew up in Halifax harbour on 6 December 1917, destroying much of the town by airblast but also generating tsunami which caused significant damage and a number of deaths outside the blast zone. Wave runups of several metres were recorded in these more distant areas. With explosive cargoes (bulk nitrate fertiliser, Liquified Natural Gas (LNG), ammunition, etc.) equivalent to up to a few tens of kilotons explosive yield now common, significantly larger explosion-generated tsunami are possible and will cause damage over proportionately larger areas relative to the airblast damage area, because of the different attenuation functions for tsunami and atmospheric body waves.