Here are some stills and a very short clip. This is definitely the movie you are looking for, though. badmovies.org/movies/lastdays/
You can find it on this page (scroll down to "Banned Toho"): wtf-film.com/site/sale/
The movie's Japanese title is "Nosutoradamusu no daiyogen" (literal translation: "Great Prophecies of Nostradamus"). It was released in 1974. Also known as "Catastrophe: 1999" and "The Last Days of Planet Earth".