When the power and the nature of God takes any visible form, people call it glory of God.
The power of God and nature of God are released into this realm through the door of His authority. The power of God and glory of God are not same thing. Power is an invisible thing and glory is a visible thing.
As far as man is concerned, his power is released:
1. Over the sin and (Matt. 9)
2. Over the demons (Matt. 8)
And people glorified The Lord seeing it.
His nature was expressed:
1. On the cross (centurion found His nature by earth quake and darkness etc.)
2. On the hill (bible says that they saw the glory of God on the hill of transfiguration)