Quadrupling synonyms

The crack grew fast, flying down the trail towards Gabriel.  The sound of the earth tearing grew louder.  The trees on either side of her expanded, quickly doubling and then quadrupling in size.  Afraid of being crushed between them, Katie darted off the trail towards Andre, who ran ahead of her.

The quadrupling of the intensity in passing outwards from the edge of the shadow is, however, accompanied by fluctuations giving rise to bright and dark bands.

But old Adolph could rest in peace beneath the crabgrass in Pine Grove Cemetery, content in the knowledge that his handiwork had held up well while more than quadrupling in value.