Passage 7.24.6
ἔστι δὲ καὶ Ὁμήρῳ πεποιημένα ἐς Ἑλίκην καὶ τὸν Ἑλικώνιον Ποσειδῶνα. χρόνῳ δὲ ὕστερον Ἀχαιοῖς τοῖς ἐνταῦθα, ἱκέτας ἄνδρας ἀποστήσασιν ἐκ τοῦ ἱεροῦ καὶ ἀποκτείνασιν, οὐκ ἐμέλλησε τὸ μήνιμα ἐκ τοῦ Ποσειδῶνος, ἀλλὰ σεισμὸς ἐς τὴν χώραν σφίσιν αὐτίκα κατασκήψας τῶν τε οἰκοδομημάτων τὴν κατασκευὴν καὶ ὁμοῦ τῇ κατασκευῇ καὶ αὐτὸ τῆς πόλεως τὸ ἔδαφος ἀφανὲς ἐς τοὺς ἔπειτα ἐποίησε.
Homer also makes references to Helice and to Poseidon Heliconius. Later, the Achaeans living there drove some suppliants out from the sanctuary and slew them; the vengeance from Poseidon did not delay—immediately afterwards, an earthquake struck their land, destroying the buildings, and along with the structures, causing even the very ground of the city to disappear from the sight of future generations.