Our sloppy, modern online English dictionaries define an apocalypse as some version of a Jewish or Christian end-of-world scenario described in words. That popular usage is close enough for our purposes.
You can read this next portion of Habakkuk a number of ways. It is called a “prayer” (or more likely a “psalm” — psalms are usually prayers anyway), but it is also pretty clearly the substance of the “oracle” the prophet says he saw in 1:1. Everything else in the book could easily have been revealed to Habakkuk by the Lord verbally, and probably was; the earlier portions scan best as a dialogue or an argument rather than as a vision.
This chapter, on the other hand, is an optical feast. You would need a top notch Hollywood special effects crew or a lot of CGI to make it happen convincingly onscreen.