Andrew of Caesarea
Voices, lightning, and thunder, like those that sounded on Sinai (cf. Ex. 19:16-19) at the manifestation of God, signify the terrifying power of what will take place on earth at the second coming of Christ.
The earthquake points to the transformation of what exists, according to the Apostle's words: "Yet once more I will shake not only the earth, but also heaven" (Heb. 12:26).