Actually the 6th seal speaks about the second coming events but they are not happening at the time of the opening. That's why Christ remains in heaven opening the next seal rather than leaving to return to Earth.
You are not going to be able to understand revelation unless you understand that the coming of Jesus in Matthew 24 after the tribulation is the same coming of Jesus that is shown at the 6th seal.
Christ does not remain in heaven at the 6th seal, he comes to the clouds and sends His angels to gather the elect from heaven and earth.
Matt 24:29
Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken:
30 And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
31 And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.
Rev 6:12
And I beheld when he had opened the sixth seal, and, lo, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became as blood;
13 And the stars of heaven fell unto the earth, even as a fig tree casteth her untimely figs, when she is shaken of a mighty wind.
14 And the heaven departed as a scroll when it is rolled together; and every mountain and island were moved out of their places.
15 And the kings of the earth, and the great men, and the rich men, and the chief captains, and the mighty men, and every bondman, and every free man, hid themselves in the dens and in the rocks of the mountains;
16 And said to the mountains and rocks, Fall on us, and hide us from the face of him that sitteth on the throne, and from the wrath of the Lamb:
17
For the great day of his wrath is come; and who shall be able to stand?
Nope, that is when the wrath of God begins:
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.
The wrath of God begins at the 7th seal with the blowing of the 1st trumpet. The wrath of God is over when the 7th angel begins to sound. That is why the mystery of God is finished. That is why the kingdoms of this world become the kingdoms of our Lord. That is why it is the time the dead are judged and rewards are given. As I said before, The vials are just a different view of the wrath of God.
After the wrath of God is over at the 7th trumpet, you get a different view of what happens in the seals in Rev 13 and 14. Then you see the same coming of Jesus that you saw in Matt 24 immediately after the tribulation, in Rev 14.
Rev 14:14
And I looked, and behold a white cloud, and upon the cloud one sat like unto the Son of man, having on his head a golden crown, and in his hand a sharp sickle.
15 And another angel came out of the temple, crying with a loud voice to him that sat on the cloud, Thrust in thy sickle, and reap: for the time is come for thee to reap; for the harvest of the earth is ripe.
16 And he that sat on the cloud thrust in his sickle on the earth; and the earth was reaped.
17 And another angel came out of the temple which is in heaven, he also having a sharp sickle.
18 And another angel came out from the altar, which had power over fire; and cried with a loud cry to him that had the sharp sickle, saying, Thrust in thy sharp sickle, and gather the clusters of the vine of the earth; for her grapes are fully ripe.
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And the angel thrust in his sickle into the earth, and gathered the vine of the earth, and cast it into the great winepress of the wrath of God.
The coming of Jesus in Rev 14 is the same coming of Jesus in Matt 24, is the same coming of Jesus that you see at the 6th seal.
Armageddon doesn't even happen until after the 7th trump has sounded, then the first 6 vials must pour. It is the 6th vial that makes them gather at Armageddon.
If Armageddon doesn't happen until after the 7th trumpet has sounded how is the mystery of God over when the 7th trumpet sounds? How are the kingdoms of the world become the kingdoms of our God? Why is the dead being judged and rewards given. Also note what is happening at the 6th trumpet, and most of all note that we are not told what is happening during the 7 thunders.
Rev 6:13 And the sixth angel sounded, and I heard a voice from the four horns of the golden altar which is before God,
14
Saying to the sixth angel which had the trumpet, Loose the four angels which are bound in the great river Euphrates.
15 And the four angels were loosed, which were prepared for an hour, and a day, and a month, and a year, for to slay the third part of men.
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And the number of the army of the horsemen were two hundred thousand thousand: and I heard the number of them.
17 And thus I saw the horses in the vision, and them that sat on them, having breastplates of fire, and of jacinth, and brimstone: and the heads of the horses were as the heads of lions; and out of their mouths issued fire and smoke and brimstone.
18
By these three was the third part of men killed, by the fire, and by the smoke, and by the brimstone, which issued out of their mouths.