If the guy taking the video 1 1/2 miles away was knocked to the floor by the shock wave...
http://www.nuclearsecrecy.com/nukemap/
This sounds even more powerful than the fertilizer plant explosion in Texas. Of course the Chinese would play this down!
I see your link shows a map of the DC metropolitan area. Are you aware that the citizens of Maryland and DC are even now being urged to allow Exelon, owner of 23 aging nuclear power plants to take over the local PEPCO electrical distribution company? Excelon now owns Three Mile Island nuclear plant which cost over a $billion and 14 years to clean up after the 1970s disaster. Those 23 plants are going to cost more and more each year to keep in production doing great things for the utility bills in MD and DC.