Tsunamis will be part of the sign of the end of the age

Revelation 6:12 "There was a great earthquake."

Revelation 6:14 "...every mountain and island was removed from its place."

Luke 21:25 "On the earth, nations will be in anguish and perplexity at the roaring and tossing of the sea."

Are you ready for the great tribulation?

REVELATION 6:9,11b "When He opened the fifth seal, I saw under the altar the souls of those who had been slain for the word of God and for the testimony which they held.....it was said to them that they should rest a little while longer, until both the number of their fellow servants and their brethren, who would be killed as they were, was completed."
12:11 "And they overcame him by the blood of the Lamb and by the word of their testimony, and they did not love their lives to the death."
12:17 "And the dragon was enraged with the woman, and he went to make war with the rest of her offspring, who keep the commandments of God and have the testimony of Jesus Christ."
13:7 "It was granted to him to make war with the saints and to overcome them."
13:15 "He was granted power to give breath to the image of the beast, that the image of the beast should both speak and cause as many as would not worship the image of the beast to be killed."

The day of the Lord in Acts

Acts 2:20 "The sun shall be turned into darkness, and the moon into blood, before the coming of the great and awesome day of the Lord."
A prophesied event before the day of the Lord is a prophesied event before the rapture. The rapture will not happen until many prophesied events occur.

The day of the Lord in Isaiah 13

Isaiah 13:9 "Behold, the day of the Lord comes, cruel with both wrath and fierce anger, to lay the land desolate; and He will destroy its sinners from it."
The day of the Lord will be the time of God's wrath. The great tribulation is the time of Satan's wrath through the anti-christ(Revelation 12-13).

The day of the Lord in Revelation

Revelation 5:9-10 "When he opened the fifth seal, I saw under the altar the souls of those who had been slain because of the word of God and the testimony they had maintained. They called out in a loud voice, "How long Sovereign Lord, holy and true, until you judge the inhabitants of the earth and avenge our blood?"
The great tribulation was occurring. The martyrs were waiting for the day of the Lord, when God would punish the unbelievers.
The sign of the day of the Lord happens at the 6th seal (6:12-16).
6:17 "For the great day of their wrath has come, and who can stand?"
In chapter 7 we see the raptured Church. In chapter 8 the day of the Lord begins.

The Church will be here until the "end of the age"

Matthew 28:20 "I am with you always, to the very end of the age."

Matthew 13:39 "the harvest is the end of the age, and the harvesters are angels."

Matthew 24:3 "What will be the sign of your coming and of the end of the age?"

Matthew 24:6 "...such things must happen, but the end is still to come."

Matthew 24:13 "he who stands firm to the end will be saved."

Matthew 24:14 "And this gospel of the kingdom will be preached in the whole world as a testimony to all nations, and then the end will come."

Matthew 24:15-28 describes the great tribulation

Matthew 24:29 "Immediately after the distress(tribulation) of those days "the sun will be darkened, and the moon will not give its light; the stars will fall from the sky, and the heavenly bodies will be shaken."

That verse describes the sign of the end of the age. The Church is still here. In verses 30-31 the Church is raptured.

The great tribulation will be shortened

The great tribulation will not last 7 years. It will start in the middle of Daniel's 70th week (Daniel 9:24-27 Matthew 24:15,21). It will be shortened by the arrival of Jesus. Matthew 24:22 "And unless those days were shortened, no flesh would be saved; but for the elect's sake those days will be shortened."
Mark 13:20 "And unless the Lord had shortened those days, no flesh would be saved; but for the elect's sake, whom He chose, He shortened the days."
When Jesus arrives he will rapture the church and begin the day of the Lord.