Zephaniah 1:2-18 refers to Yahweh's judgment. Zephaniah 1:4-16 describes Yahweh's judgment on the people of Judah. In Zephaniah 1:8-13, Yahweh is speaking. He alternates between using first person and speaking about himself in the third person. (See: [[rc://en/ta/man/translate/figs-123person]])
This refers to the sound of buildings collapsing. This can be stated explicitly. Alternate translation: "a loud sound of buildings collapsing" (See: [[rc://en/ta/man/translate/figs-explicit]])