Tidal Wave (English Language Version) (1975)

aka's: Nippon Chinbotsu/The Submersion Of Japan/Japan Sinks/
日本沈没

Cities become raging firestorms, but the worst is yet to come. Racked by earthquakes and volcanoes, Japan is slowly sinking into the sea. A race against time and tide begins as Americans and Japanese work together to salvage some fraction of the disappearing Japanese islands. Features a fine display of special effects executed by Teruyoshi Nakano. Stars Lorne Greene, Keiju Kobayashi, Rhonda Leigh Hopkins and Hiroshi Fujioka. Also with Tetsurô Tanba, Ayumi Ishida and Andrew Hughes.