The other variable is the depth of the blast, which is unknown. Guesses are about 300 meters max.
This article gets a bit out of hand at the size of the yield.
NORSAR has estimated a yield of no more than 120 kilotons of TNT, six times larger than the atomic bomb dropped on Nagasaki.
The most disturbing fact is not the size of the yields, but the 3rd blast portion could have only occurred by a fusion blast.....That’s an H-bomb. How did they manage that?
It’s been my take for a long time that China was much more involved than we were led to believe.
There’s your source.
Thank you for your observations, estimations. I appreciate your insight.