Rev 6:16 And they cried to the mountains and the rocks, "Fall on us and hide us from the face of the One who sits on the throne and from the wrath of the Lamb.
Rev 6:17 For the great day of their wrath has come, and who is able to survive?"Rev 7:9 After this I saw a vast crowd, too great to count, from every nation and tribe and people and language, standing in front of the throne and before the Lamb. They were clothed in white robes and held palm branches in their hands. ..."These are the ones who died in the great tribulation. They have washed their robes in the blood of the Lamb and made them white.Rev 8:11 The name of the star was Bitterness. It made one-third of the water bitter, and many people died from drinking the bitter water.Rev_6:8 I looked up and saw a horse whose color was pale green. Its rider was named Death, and his companion was the Grave. These two were given authority over one-fourth of the earth, to kill with the sword and famine and disease and wild animals.Rev 9:15 Then the four angels who had been prepared for this hour and day and month and year were turned loose to kill one-third of all the people on earth.
Rev 9:18 One-third of all the people on earth were killed by these three plagues—by the fire and smoke and burning sulfur that came from the mouths of the horses.Rev 11:13 At the same time there was a terrible earthquake that destroyed a tenth of the city. Seven thousand people died in that earthquake,Rev 16:19 The great city of Babylon split into three sections, and the cities of many nations fell into heaps of rubble. So God remembered all of Babylon's sins, and He made her drink the cup that was filled with the wine of His fierce wrath.
Rev 16:20 And every island disappeared, and all the mountains were leveled.
Rev 16:21 There was a terrible hailstorm, and hailstones weighing as much as seventy-five pounds fell from the sky onto the people below. They cursed God because of the terrible plague of the hailstorm.
It seems that in just two plagues, 1/2 of the earth dies. But there are a multitude of other judgments and plagues which kill people. Is there any indication how many people will ultimately survive the judgments of the seven final years immediately preceding the return of our Lord?