4.7 Magnitude = 12 Kilotons.
Yo!
I'm no geologist or atomic scientist but I dug up some formula
that indicates that this first successful North Korean nuclear blast
yesterday could be about 12 Kilotons yield; a Hiroshima bomb yield.
The seismic reading was about 4.7 mag so it seems that the NK
now have 1/2 dozen city-busting capable nukes.
Move out of Seattle, Vancouver, Tokyo, Anchorage and Seoul
cuz the NK leaders will soon have the missiles to reach America.
My dad in Philly, who served in SK IN 1951, says that Doug MacArthur
should have been allowed to nuke Pyongyang.
He's conservative, and a vet who saw men die around him.
He has a right to say those things though I disagree with him.
J-W