Martin B. Kalinowski, a nuclear expert at the University of Hamburg, said a magnitude of 4.7 corresponded to a nuclear explosive yield of about three to eight kilotons of high explosives, with the most likely yield being four kilotons. A blast that generated a tremor with a magnitude of 4.5 would be smaller. In contrast, the primitive bombs dropped on Hiroshima and Nagasaki had explosive yields of 15 kilotons and 22 kilotons, respectively.

It's almost like he's toying with the developed world.