Information on the GBU-43/B and effects.
The Guardian:
To target what the military described as a tunnel complex used by the Islamic States Afghanistan affiliate, the US for the first time used what the military colloquially calls the mother of all bombs, the GBU-43/B.
Designed for destroying underground targets but not itself a deep-earth penetrator weapon, the GBU-43/B has the explosive yield of more than 11 tons of TNT. The massive bomb is dropped from air force planes and detonates before reaching the ground, resulting in an enormous blast radius. Only the Massive Ordnance Penetrator GBU-57, which has never been used in war, is a larger conventional weapon.
The psychological effect on survivors or observers is considered an added impact of the weapon.
Army general John W Nicholson, the commander of US forces in Afghanistan, said in a statement that the GBU-43/B was the right munition to use against the Islamic State in Khorosan, or Isis-K.
Link:
https://www.theguardian.com/world/2017/apr/13/us-military-drops-non-nuclear-bomb-afghanistan-islamic-state?CMP=twt_gu