This is a fascinating book and well worth reading. Question? Was this explosion more or less than the Tungusku (sp?) meteor? Also, what would it have done over an urban location?
173 kt vs 440kt (Chelyablinsk), this one was much smaller
I'm not sure of the altitude at detonation, otherwise I'd take a stab at the level of damage and mortality had it happened over an urban location. Regarding the Tunguska object:
At 7:17 a.m. (local Siberia time), at a height of about 28,000 feet, the combination of pressure and heat caused the asteroid to fragment and annihilate itself, producing a fireball and releasing energy equivalent to about 185 Hiroshima bombs. [NASA Science Mission Directorate]