Jamieson, Fausset and Brown on Revelation 6:14

14. departed--Greek, "was separated from" its place; "was made to depart." Not as Alford, "parted asunder"; for, on the contrary, it was rolled together as a scroll which had been open is rolled up and laid aside. There is no "asunder one from another" here in the Greek, as in Ac 15:39, which Alford copies.

mountain ... moved out of ... places--(Psa 121:1, Margin; Jr 3:23; 4:24; Na 1:5). This total disruption shall be the precursor of the new earth, just as the pre-Adamic convulsions prepared it for its present occupants.