Here is the context of Revelation 16:13-21 NWT:
Events as a result of the pouring out of the sixth bowl:
13 And I saw three unclean inspired expressions [that looked] like frogs come out of the mouth of the dragon and out of the mouth of the wild beast and out of the mouth of the false prophet.
14 They are, in fact, expressions inspired by demons and perform signs, and they go forth to the kings of the entire inhabited earth, to gather them together to the war of the great day of God the Almighty.
15 “Look! I am coming as a thief. Happy is the one that stays awake and keeps his outer garments, that he may not walk naked and people look upon his shamefulness.”
16 And they gathered them together to the place that is called in Hebrew Har–Ma·ged′on.
Events as a result of the pouring out of the seventh bowl:
17 And the seventh one poured out his bowl upon the air. At this a loud voice issued out of the sanctuary from the throne, saying: “It has come to pass!”
18 And lightnings and voices and thunders occurred, and a great earthquake occurred such as had not occurred since men came to be on the earth, so extensive an earthquake, so great.
Events that occur during or as a result of the "great earthquake":
- 19 And the great city split into three parts, and the cities of the nations fell; and Babylon the Great was remembered in the sight of God, to give her the cup of the wine of the anger of his wrath.
- 20 Also, every island fled, and mountains were not found.
- 21 And a great hail with every stone about the weight of a talent descended out of heaven upon the men, and the men blasphemed God due to the plague of hail, because the plague of it was unusually great. 17 And one of the seven angels that had the seven bowls came and spoke . . .
Just going by the immediate context, "Armageddon" is a symbolic place that is arrived at before the "great earthquake" begins. If there is a correspondence with Matthew 24, it would have to be with Matthew 24:15, that is, a situation that is arrived at just before the great earthquake begins. It would appear, based on Revelation 16:16, 17 to be THE event that triggers the pouring out of the seventh bowl, which results in the "great earthquake." See also my post here. You might also note a similarity of the pouring out of the seventh bowl with the blowing of the seventh trumpet in Revelation 11:15-18.
Extending the point further, this would mean that all of the "great earthquake" takes place at Armageddon, since that is where "the kings of the earth" have been gathered to when the great earthquake breaks out.
Bobcat