Why North Korea’s H-bomb test is a Failure

Experts have cast serious doubts on North Korea's claims that it had successfully a hydrogen bomb, saying the resulting seismic activity suggested a far smaller device than Hydrogen bomb
An explosion that triggered a 5.1-magnitude earthquake.

But scientists and intelligence agencies were quick to dismiss the report, saying the size of the blast was too small to have come from such a weapon and was likely disguised to appear like one.

As opposed to the atomic bomb, like the one dropped on Hiroshima in 1945, a hydrogen device can be up to 1,000 times more powerful.

However, South Korea's spy agency said the blast from North Korea's device produced an explosive yield of just six kilotons,