Bona nit!
I think the following links may be useful.
In this one, I've make some proofs and it allow you to enter a ground level burst of 0.1 kt. Sadly, only damage caused by overpressure is showed:
http://meyerweb.com/eric/tools/gmap/...?inpyield=0.1#
The following one gives you more information, but seems that the minimum power of the burst is 1kT and the figures showed "assume optimum burst height":
http://www.stardestroyer.net/Resourc...xplosions.html