Revelation 6:12-14
I looked when He opened the sixth seal, and behold, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became like blood. And the stars of heaven fell to the earth, as a fig tree drops its late figs when it is shaken by a mighty wind. Then the sky receded as a scroll when it is rolled up, and every mountain and island was moved out of its place.
This “shaking” is going to begin when the Lamb opens the sixth seal of the scroll. It will happen “once more” according to the text. Not twice. Not additional times. The cataclysmic events beginning with the sixth seal are unique. They will involve far more than a shift in the magnetic poles. It will be a true, global cataclysm.
Peter describes the destruction that follows this way:
2 Peter 3:10-12
But the day of the Lord will come as a thief in the night, in which the heavens will pass away with a great noise, and the elements will melt with fervent heat; both the earth and the works that are in it will be burned up. Therefore, since all these things will be dissolved, what manner of persons ought you to be in holy conduct and godliness, looking for and hastening the coming of the day of God, because of which the heavens will be dissolved, being on fire, and the elements will melt with fervent heat?
A lot of things must happen before this “shaking”. A few years worth of signs must happen, which match with seals 1-5. Considering the additional details provided in the Olivet Discourse, the cataclysm of the sixth seal will be the final sign before the return of the Lord for His elect, and the beginning of the Day of Wrath.
Believers in Christ must endure many trials before being rescued at Christ’s return.