I posit that it's definitely above 1 kiloton though. I base this on the radius of damage it caused (from photos compared to Google satellite images of the area

I posit that it's definitely above 1 kiloton though. I base this on the radius of damage it caused (from photos compared to Google satellite images of the area around the explosion site) and by comparing the explosion's apparent magnitude with that of the PEPCON blast, which was fairly carefully estimated to have been roughly 1 kiloton. This blast looks bigger and spread its impact further than the PEPCON blast..