2 Verbs to Use for the Word quakings

" He stripped off his gaberdine of scarlet And wrapped it round the aged varlet, Who clutched at the folds with a muttered curse, Quaking and chattering seven times worse.

Well, I was continuing my stroll, when I seemed to feel some quaking of the ground, and before one could count twenty, it was as if the island was bent upon wracking itself to pieces.

2 Verbs to Use for the Word  quakings