Arnold Fruchtenbaum claims,
“The sixth seal does portray a cosmic disturbance, but nowhere does it say that it is that cosmic disturbance which kicks off the day of the Lord” (emphasis mine)*
On the contrary, a little good ol’ fashion comparing Scripture with Scripture will easily refute such a claim:
“Now when the Lamb opened the fifth seal, I saw under the altar the souls of those who had been violently killed because of the word of God and because of the testimony they had given. They cried out with a loud voice, “How long, Sovereign Master, holy and true, before you judge those who live on the earth and avenge our blood?” Each of them was given a long white robe and they were told to rest for a little longer, until the full number was reached of both their fellow servants and their brothers who were going to be killed just as they had been. Then I looked when the Lamb opened the sixth seal, and a huge earthquake took place; the sun became as black as sackcloth made of hair, and the full moon became blood red. . . . .” (Rev 6:9–12)
“I will produce portents both in the sky and on the earth— blood, fire, and columns of smoke. The sunlight will be turned to darkness and the moon to the color of blood, before the day of the LORD comes— that great and terrible day!” (Joel 2:30–31)
“Immediately after the tribulation of those days, the sun will be darkened, and the moon will not give its light; the stars will fall from heaven, and the powers of heaven will be shaken. Then the sign of the Son of Man will appear in heaven, and all the tribes of the earth will mourn. They will see the Son of Man arriving on the clouds of heaven with power and great glory. And he will send his angels with a loud trumpet blast, and they will gather his elect from the four winds, from one end of heaven to the other.” (Matt 24:29–31)
“And there will be signs in the sun and moon and stars, and on the earth nations will be in distress, anxious over the roaring of the sea and the surging waves. People will be fainting from fear and from the expectation of what is coming on the world, for the powers of the heavens will be shaken. Then they will see the Son of Man arriving in a cloud with power and great glory. But when these things begin to happen, stand up and raise your heads, because your redemption is drawing near.” Then he told them a parable: “Look at the fig tree and all the other trees. When they sprout leaves, you see for yourselves and know that summer is now near. So also you, when you see these things happening, know that the kingdom of God is near.” (Luke 21:25–31)
* Fruchtenbaum, Arnold G. “Is There a Pre-Wrath Rapture?” In When the Trumpet Sounds, edited by Thomas Ice and Timothy Demy, 396.