Possible meanings are 1) this is a metaphor in which the author describes the kings being afraid as if they were ships that shake because God destroys them with a strong wind. Alternate translation: "They shook with fear, as the ships of Tarshish shake when you break them with the east wind" or 2) this is an apostrophe in which the author describes God's great power. (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-apostrophe]])