“no evidence”
uh....
no public evidence....
Trust me.
Anyway, EMSC after seismologist review puts it at 5.0; so that’s at least 5 kilotons, possibly as many as 9 or 10 kilotons.
If it was a fake it would be by far the largest deliberate conventional explosion ever (only one larger would be the explosion of the Soviet Moon rocket).
It would almost be easier to build a nuke than fake something this big.