[Exsubmariner]

I'm kind of skeptical, too. There are perhaps conventional weapons that will do this sort of damage.

A nuclear reactor is steal and concrete and uranium. From a conventional weapon, I would expect there to be lots of debris. If you could find a higher resolution image, I might be able to identify something. But, it looks like there is nothing but complete atomization at the site. No debris at all.

I have been to both Hiroshima and Nagasaki, however, and the image of the site struck me as being remarkably similar.

As for satellites and seismographs, I think the Isreali's have a strong corner on that market in that part of the world. It will be interesting to see if this develops and what data from Europe shows.