“And the angel took the censer, and filled it with fire of the altar, and cast it into the earth: and there were voices, and thunderings, and lightnings, and an earthquake.”
King James Version (KJV)
8:5 And there were thunderings, and lightnings, and voices, and an earthquake - These, especially when attended with fire, are emblems of God's dreadful judgments, which are immediately to follow.
Re 8:5 And the angel . . . filled it with the fire of the altar. Fire is usually a symbol of suffering. And cast [it] into the earth. This fire cast from the altar upon the earth indicates that the judgments of God are about to fall upon it. "The earth" in the sense used by John is the great Roman Empire, which embraced the civilized world. And there were voices, and thunderings, and lightnings, and an earthquake. These mutterings and the quakings are ominous of the terrible scenes to follow when the angels sound their trumpets.