What does Zechariah 14:4 mean?

On that day, His feet will stand on the Mount of Olives, east of Jerusalem. The mountain will split in two from east to west, forming a huge valley, with half the mountain moving north and half moving south. Zechariah 14:4 - Modern Text Bible

(God’s presence will be so powerful that the very landscape will change, opening a way for His people and showing His authority over creation.)