What does Revelation 16:18 mean?
Lightning, thunder, and a devastating earthquake occurred when the seventh angel poured his bowl into the air. A similar occurrence followed the seventh seal judgment (Revelation 8:5) and the sixth and seventh trumpet judgments (Revelation 11:13, 19). It's reasonable to assume those earthquakes would have brought severe destruction, but the earthquake that follows the outpouring of the seventh bowl is unprecedented in magnitude and destruction. Revelation 16:18 describes it as the greatest earthquake to strike the earth in human history. What is described in the following verses has led interpreters to suggest that the geography of the entire world will be changed—that this event will be worldwide, and not restricted to the region of Israel. If so, then global mountains and coastlines will be altered.This judgment is a precursor to the calamities that follow. It may also be a preview of what happens when Jesus returns to earth to establish His kingdom. Zechariah 14:4 predicts that when the Lord returns to earth, His feet will stand on the Mount of Olives, the place from which He ascended into heaven, and the Mount of Olives will experience an earthquake. The Mount of Olives will split in two from east to west, with a northern half and a southern half.