I don’t know if 15KT at 1KM DOB would produce a large enough cavity for a subsidence crater to form.
The initial reports of the seismic event occurring 1km underground were erroneous. I knew that the 1km figure couldn’t be right when I first heard about it. So, last night, I called up one of my geologist buddies and asked him about it. He looked at his data and calculated it at less than a 10th of a kilometer underground.
So, I’m fairly confident there’s going to be a nice, lovely subsidence crater for me to measure once the satellite imaging comes out.
Cheers!