I've wondered if Rev 9 described a super volcano:
Then the fifth angel sounded his trumpet, and I saw a star that had fallen from heaven to earth, and it was given the key to the pit of the Abyss. The star opened the pit of the Abyss, and smoke rose out of it like the smoke of a great furnace, and the sun and the air were darkened by the smoke from the pit.
Rev 9
If it is submarine magma on the move, it must be a huge amount.
However that leads to two questions. First, how does submarine movement of magma cause a .17hz wave movement, and second, how did Q know it would happen lo these many months ago?