A Great Earthquake
“17 And the seventh angel poured out his vial into the air; and there came a great voice out of the temple of heaven, from the throne, saying, It is done.
18 And there were voices, and thunders, and lightnings; and there was a great earthquake, such as was not since men were upon the earth, so mighty an earthquake, and so great.
19 And the great city was divided into three parts, and the cities of the nations fell: and great Babylon came in remembrance before God, to give unto her the cup of the wine of the fierceness of his wrath.
20 And every island fled away, and the mountains were not found.
21 And there fell upon men a great hail out of heaven, every stone about the weight of a talent: and men blasphemed God because of the plague of the hail; for the plague thereof was exceeding great.”
(Rev 16:17-21 KJV)
This is the most powerful earthquake the world has ever seen. It will destroy cities, nations, lands, mountains, islands, and it will flatten the land. It will be so terrible that it takes the next two chapters to describe it.
It was foretold by Jeremiah.
“29 For, lo, I begin to bring evil on the city which is called by my name, and should ye be utterly unpunished? Ye shall not be unpunished: for I will call for a sword upon all the inhabitants of the earth, saith the LORD of hosts.
30 Therefore prophesy thou against them all these words, and say unto them, The LORD shall roar from on high, and utter his voice from his holy habitation; he shall mightily roar upon his habitation; he shall give a shout, as they that tread the grapes, against all the inhabitants of the earth.
31 A noise shall come even to the ends of the earth; for the LORD hath a controversy with the nations, he will plead with all flesh; he will give them that are wicked to the sword, saith the LORD.
32 Thus saith the LORD of hosts, Behold, evil shall go forth from nation to nation, and a great whirlwind shall be raised up from the coasts of the earth.
33 And the slain of the LORD shall be at that day from one end of the earth even unto the other end of the earth: they shall not be lamented, neither gathered, nor buried; they shall be dung upon the ground.”
(Jer 25:29-33 KJV)
Great hail stones will fall upon man and they will blaspheme God because of it. This shows that they will know this is the wrath of God. The Battle of Armageddon is about to begin.