a. The thunders are included within the trumpets and can be placed within the ranks of the 7 trumpets
"When he shouted, the voices of the seven thunders spoke. And when the seven thunders spoke, I was about to write; but I heard a voice from heaven say,
“Seal up what the seven thunders have said and do not write it down.”
Therefore, neither you nor I nor anyone has any idea what the seven thunders said and we therefore cannot apply them as belonging to the seals, trumpets and bowl judgments or anything else.
b. It amazes me how you take the words of lost men hiding in caves over the declared announcement in heaven, before the throne concerning the wrath and it's arrival at the 7th trump
We also have the announcement of wrath at the opening of the 6th seal (Rev.6:17), with the bowl judgments also referred to as wrath (Rev.15:1)
The reason those men are hiding in caves is because of the events of the previous seals of wrath combined with the events of the 6th seal, the great earthquake, the sun being darkened, the moon turning blood red and the heavens being rolled up so that the inhabitants of the earth can see God on his throne, which is why they are running into the holes in the ground and asking for the rocks to fall on them.
The words "has come" in the announcement of "the great day of their wrath
has come and who can endure it," is in the aorist tense, which means that it is speaking about God's wrath in its entirety, meaning what will have already taken place prior to the announcement (seals) and the events of wrath that will take place after the announcement, which would include the trumpets and bowl judgments.
The seals, trumpets and bowl judgments belong together as a set of God's wrath and should not be dissected into one part being tribulation and the others as wrath. Jesus is the one who tramples the wine-press of the wrath of God Almighty and he begins it with the opening of the seals, which lead into the trumpets, followed by the bowls/vials.
Once the church has been gathered as represented in Rev.4:1, then that first seal will be opened, which is represented by the rider on the white horse as the antichrist who goes out to conquer and is bent on conquest.
Regarding "b" above, prior to the 7th trumpet scripture states that at the 4th seal and the 6th trumpet, a fourth and a third, respectively, of the earths population will be killed, which would equal over have of the earths population dead. And you don't think that this will be a result of God's wrath? That entire seven years is God's wrath. Every event that takes place in that period is apart of God's wrath, from the seals, trumpets, and bowl judgments, to the plagues that the two witnesses bring upon the earth, to the reign of the beast during that last 3 1/2 years. It is all apart of God's time of wrath.
Regarding this, the church is not appointed to suffer God's wrath, whether the wrath that will be coming upon the earth nor the wrath that results as being cast into the lake of fire. And that because Jesus already took upon himself the wrath that every believer deserves. The wrath of God no longer rests upon those who are in Christ. Scripture also states that Jesus rescues us from the coming wrath (1 Thes.1:10) and that he would keep us out of that hour of trial that is coming upon the whole earth (Rev.3:10)
The Lord's promise in John 14:1-3 to take the church back to the Father's house is going to take place as described in detail in 1 Thessalonians 4:13-17 and is going to take place prior to the first seal being opened which initiates God's wrath.