From: The Mighty Thor #22, 2010
What’s the difference between Thor’s Godblast and Anti-Force?
With the Godblast, Thor is capable of channeling different amounts of his godly energies in combination with the mystical properties of Mjolnir can be channeled through his hammer for a single massive blast. The God Blast is so immensely powerful and destructive that it has proven capable of destroying beings as large and as powerful as the being Galactus, who was forced to flee for his life.
Thor is capable of producing an indescribably powerful blast known as the Anti-Force which is capable of annihilating entire planets. This blast is so powerful that with just a single emission, Thor was capable of putting down and seemingly killing Mangog himself.