The Lord again revealed that a unique disaster was coming. It would be an end for the Israelites, and it was near. Their doom would soon arrive as a tumult on the mountains, not as a joyful sound. The Lord was about to judge His people for all their abominations. He would show no pity. They would then know that He was the Lord. This oracle stresses the horror and surprise of the coming judgment as well as the person judging. The last phrase is a new name for God: Yahweh makkeh, "the Lord who strikes."[source]
"To hearers and readers who were used to names of God like "Jehovah-jireh" and "Jehovah-nissi" ( Genesis 22:14; Exodus 17:15), it must have come home with tremendous force to have Him described as "Jehovah-makkeh". The Lord who had provided and protected was about to strike." [1][source]