I thought I already saw that movie, but turns out I saw a remake[1] of an earlier movie[2] which that movie is a parody of. And...they are still getting mileage out of the idea[3].

[1] https://en.wikipedia.org/wiki/Sinking_of_Japan

[2] https://en.wikipedia.org/wiki/Submersion_of_Japan

[3] https://en.wikipedia.org/wiki/Japan_Sinks:_People_of_Hope