why not just https://skripthub.net/docs/?id=1128
Skript Hub - Documentation
Creates an explosion of a given force. The Minecraft Wiki has an article on explosions which lists the explosion forces of TNT, creepers, etc.
Hint: use a force of 0 to create a fake explosion that does no damage whatsoever, or use the explosion effect introduced in Skript 2.0.
Starting with Bukkit 1.4.5 and Skript 2.0 you can use safe explosion...