I've been astonished in preaching through Revelation just how full of Old Testament imagery is the book of Revelation.Preaching on chapters 8 and 9 this morning it is easy to see how these chapters are fertile fields for nut-bars imagining that what John is describing is nuclear fallout, war planes and helicopters.
However, when one picks upon the OT imagery it is clear that the language is not so much John trying to put into words visions he sees of the 20th and 21st centuries, but John using Old testament language and categories to describe the visions of the state we have been and shall be experiencing from the resurrection of Christ until his return.
There are recapitulations of the 10 plagues of God's judgment against Egypt (Blood, locusts, hail, darkness, and stubborn unrepentance). There are undoings of Gen1-2 itself as there are attacks upon the earth, sea, springs of water, the very sky and ultimately God's image bearers themselves. And that is just scratching the surface, not to mention the use of imagery from Ezekiel, Daniel, Jeremiah, Joel, Psalms, Proverbs and more.