The Sixth Seal is the Day of the Lord's wrath. It is described over 70 times in the Bible, as Day of fire, plus all the other effects.
Malachi 4:1 The Day comes, burning like a furnace, all arrogant evildoers will be as stubble, they will be destroyed in a fiery blaze.
Psalm 11:4-6 The Lord is in heaven, raining fiery coals upon the wicked.
Hebrews 10:27...a terrifying judgement of fire, that will consume God's enemies.
2 Thessalonians 1:6-9 It is just that God should send affliction on those who afflict you, when the Lord is revealed from heaven with His mighty angels, in blazing fire. He will punish those who refuse to acknowledge or obey God. They will suffer the penalty of eternal destruction, cut off from the Lord. [verse 10 tells of the later Return of Jesus in His glory.]
Isaiah 30:26-30 On the Day the Lord saves His people, the sun will shine with 7 times its normal strength and the Lord will make His voice heard in majesty, His arm descending in fierce anger with devouring flames of fire, amid rain and hail storms.
Psalm 144:5-6 Lord part the heavens, make lightning flashes far and wide.
Isaiah 34:5 For My sword appears in the heavens, it descends in judgement.
Isaiah 66:15-17The Lord is coming in fire, like a whirlwind, He will judge with fire. His sword will test mankind, many will be slain by Him.
Isaiah 29:5-6 Yet, the horde of your enemies will crumble into dust, fly away like chaff. Suddenly, in an instant, punishment will come from the Lord, with storms, earthquakes and a flame of devouring fire.
Isaiah 9:18-19 The Land is scorched by the Lord, the people are fuel for the fire.
Deuteronomy 32:41-43 I will sharpen My flashing sword and take vengeance on those who hate Me. Rejoice, you heavens the Lord will avenge His people and cleanse their Land.
Isaiah 33:14 Sinners in Zion quake with terror- can any live in this devouring fire?
Jeremiah 21:14 I shall punish Judah as they deserve, I shall set fire to your scrubland.
Ezekiel 20:45-48Prophesy to the scrubland of the Negev, I am about to kindle a fire in you- it will consume everything flammable. From the Negev, northward, everyone will be scorched by it. Reference: REB, NIV. Verses abridged.
All of these prophecies describe an event that cannot be reconciled with the Return of Jesus. At that time, He destroys the armies of the Anti Christ, by His sword. Zechariah 14:3, Revelation 19:15 & 21 They do not match the "sheep and goat" judgement in Matthew 25:31-46 Also, at the end of the Millennium, the armies of the nations again attack - Revelation 20:7-10, but the context of the above passages rules out their application to that event.
We see, in Deuteronomy 32, that this judgement will cleanse the Land. Many verses tell of a fire judgement upon Judah [the Jews] and the surrounding enemies, this will not be a nuclear exchange, as that would pollute the Land. "Flames of devouring fire" - "fire in the Negev"- "arrows like lightning"- "consuming fire",etc, all describe what would happen if a Coronal Mass Ejection [C.M.E.] struck the Middle East. The resulting population clearance, will allow the fulfilment of the many prophecies which say how the Lord's people, righteous Christian Israel will gather and settle there. These events will disrupt the world economy and set the stage for the One World government and the Anti Christ.