Polyphemus's shouting can shake all of Mount Etna

Acis and I were entirely unready for what happened next:
the wild brute suddenly saw us and cried aloud, “I can see you,
and I’ll make certain that this is the last of your loving encounters!”
The tone of his voice was as loud as you might expect in a furious
Cyclops; his shouting created a quake in the whole of Mount Etna.

Metamorphoses, "Acis, Galatea and Polyphemus," Translated by David Raeburn.