From Hesiod’s Theogony 139-141:
“Then he made from his great heart, Bronte Sterope and violent-surging Arges, they who would give Zeus his thunder and would make his lightning bolts”
— from the Italian of: Giulio Guidorizzi,
Kosmos – L’universo dei Greci: L’età arcaica (2016)
[EinaudiScuola, 2016], p 280. ISBN 9788828617907
Kosmos: The World of the Greeks I – The Archaic Age
“the Cyclops were well-named, because they had only one round eye in their forehead”
un solo occhio rotondo avevano nella fronte
The Titanomachy would have been a sight to see (from a long way away).
Zeus sky-high (and new-born fully-formed Athena with her Aegis) and a cloud of winter slowly approaching, like a wolf eating the sun. Not to mention the earthshaking coming from the sea (Poseidon). Memories of Mount Doom.
Thera is the most likely candidate, in the circumstances.
A recent night-time photo of Mt Agung erupting brought this musing on.
And in ancient times, the groaning sounds coming from underground would have fed into other thoughts, too: the place where Zeus imprisoned his enemies for eternity.