Congratulations on seeing that the earthquake when the two witnesses rise is the very same earthquake at the 7th vial.
It's obviously not the same quake.
Rev 11:13 And the same hour was there a great earthquake, and the tenth part of the city fell, and in the earthquake were slain of men seven thousand: and the remnant were affrighted, and gave glory to the God of heaven.
Rev 11:14 The second woe is past; and, behold, the third woe cometh quickly.
This quake happens at the end of the 6th trump. The quake in the 7th vial happens within the 7th trump and is found here:
Rev 11:15 And the seventh angel sounded; and there were great voices in heaven, saying, The kingdoms of this world are become the kingdoms of our Lord, and of his Christ; and he shall reign for ever and ever.
Rev 11:16 And the four and twenty elders, which sat before God on their seats, fell upon their faces, and worshipped God,
Rev 11:17 Saying, We give thee thanks, O Lord God Almighty, which art, and wast, and art to come; because thou hast taken to thee thy great power, and hast reigned.
Rev 11:18 And the nations were angry, and thy wrath is come, and the time of the dead, that they should be judged, and that thou shouldest give reward unto thy servants the prophets, and to the saints, and them that fear thy name, small and great; and shouldest destroy them which destroy the earth.
Rev 11:19 And the temple of God was opened in heaven, and there was seen in his temple the ark of his testament: and there were lightnings, and voices, and thunderings,
and an earthquake, and great hail.
And is mentioned here as well:
Rev 16:17 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.
Rev 16:18 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.
Notice the same things happening:
11:19 lightnings, and voices, and thunderings, and an earthquake, and great hail
16:18 voices, and thunders, and lightnings; and there was a great earthquake
16:21 a great hail
Same timeframe and same earthquake but not the same earthquake in 11:13
So, there is a smaller 6th trump earthquake and there is a larger (greatest in human history) quake in the 7th trump specifically when the 7th vial is poured.