When something collapses and breaks, it is when a collapse happens. Something big collapsing or falling down will probably result in its destruction.

倒壊 is a formal word often found in news or official documents. It's used to describe buildings or structures collapsing, usually from destructive forces like natural disasters or bombings.

This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.