Cataclysme force 7.9

The film was a follow-up to a TV movie from early the same year, Tokyo Daijishin Magnitude 8.1 (1980), starring Shin'ichi Chiba, with special effects by Kôichi Kawakita, and also produced by Toho.

Although the title is at the beginning, all of the credits are at the end of the movie (in the original Japanese version).

In all versions of the film, the title is shown early in the film (in the shot of the crater of Mount Mihara), but in the original Japanese version, all of the credits are at the end of the film; after the final freeze-frame of Kayo Matsuo's character (Yuko Kawazu), the film fades out, and a credit roll in white text over a black background is set to the sentimental pop song "Amethyst Sunray" (performed by Hatsumi Shibata), ending with a "The End" ("Owari") credit. In all international versions, the cast credits are placed over the opening footage of Oshima Island (before the title), and the rest of the credits over the aerial montage of Tokyo (right after the film's title), both originally credit-less, and the film ends with the final freeze-frame of Matsuo's character (with "The End" and the Toho copyright superimposed over the shot). "Amethyst Sunray" is omitted altogether.

Featured in Commander USA's Groovie Movies: Commander USA's Groovie Movies: Deathquake (1989)