The photo could not be independently verified.
Regardless of whether or not North Korea tested an actual H-bomb, as it claims, North Korea has clearly crossed the threshold from a deterrence standpoint. That was revised up from an initial report of 5.6.
"The sixth nuke test indicates that North Korea is pushing for dealing with the United States on equal footing after securing a nuclear status", said Yang Moo-jin, a professor at the University of North Korean Studies.
"If North Korea did indeed conduct a nuclear test, we absolutely can not tolerate and must protest firmly".
North Korea's official media reports news about the top leader usually one day after it takes place.
North Korea's latest claim follows the July ICBM tests that brought Kim's regime a step closer to achieving its aim of being able to deploy a nuclear warhead over the continental U.S.
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North Korea's state-run broadcaster said a "special" announcement would be made at 3 p.m.
"The North described the test of what it called a hydrogen bomb as a "perfect success".
It has been subjected to seven rounds of United Nations Security Council sanctions over its nuclear and ballistic missile programmes, but always insists it will continue to pursue them.
Hours earlier, Japanese Prime Minister Shinzo Abe spoke to President Trump on the phone about the "escalating" situation.
If the current magnitude holds, it's possible that the weapon tested Sunday was a thermonuclear device, but it's impossible to say if it was the peanut-shaped object shown in the images released by North Korean state media, says Hanham.
A second quake event measuring 4.6 magnitude detected by the China natural disaster Networks Center on Sunday may have been a tunnel collapse, a US natural disaster monitoring service said.
While some experts are sceptical of the hydrogen claim, the latest announcement from North Korea has heightened political tensions, coming just days after it launched a ballistic missile over Japan and sparking global condemnation.
Mr Trump also noted that he looks forward to continued trilateral co-ordination on the margins of the United Nations General Assembly.