Atomic or "A-bombs" work on the principle of nuclear fission, where energy is released by splitting atoms of enriched uranium or plutonium encased in the warhead.
However, Sunday's test is estimated to have a yield of about 100 kilotons, 10 times stronger than last year's test that caused a 5.3 magnitude quake.
Finally, in a radio broadcast that had been trailed as a "major announcement", North Korean state media confirmed this was no natural disaster.
The test came after images of North Korean leader Kim Jong-Un speaking with his lieutenants while looking at what appeared to be a silver bomb.
Pyongyang has defied United Nations sanctions to develop nuclear weapons and to test missiles which could potentially reach the mainland US.
The two North Korean earthquakes, measured by Chinese monitors as magnitude-6.3, and then magnitude-4.6, triggered by the hydrogen bomb explosion on Sunday, prompted reports of tremors in Chinese border towns and scrambled Chinese jets. As with the five earlier nuclear tests, there is fear of radiation leaks.
It could also begin actual deployment of its new arsenal, said Yoo Ho-Yeol of the Korea University, while seeking an opening for diplomacy with the Trump administration.
TN student who fought against NEET kills self
Medical college admissions in Tamil Nadu were conducted exclusively based on the Plus Two examination marks until 2016. Her suicide sparked a few protests across Tamil Nadu by student organisations and representatives of Dalit parties.
The MEA said by conducting the nuclear test, North Korea was once again violating worldwide law.
It is the second time this year North Korea has spectacularly disrupted Beijing's attempt to highlight its place on the world stage.
State media declared the test a complete success and said no radiation had leaked into the atmosphere.
Trump also berated longtime USA ally South Korea, saying "South Korea is finding, as I have told them, that their talk of appeasement with North Korea will not work, they only understand one thing!" The test was quickly condemned by various interested powers, including the #United States, South Korea, Japan, and China. So far all efforts to pressure North Korea - sanctions, isolation and military threats - have all failed to move Pyongyang.
"We strongly urge the DPRK to face up to the firm will of the worldwide community on the denuclearization of the peninsula, to earnestly abide by the relevant resolutions of the UN Security Council, to stop making the wrong actions which will worsen the situation and against of the DPRK's own interests, and to effectively return to the track of dialogue to solve the problem".
Analysts are divided on whether Sunday's test could lead to more North Korean provocations, or become an opening for dialogue.
Russian Federation on Sunday condemned North Korea's latest test of a nuclear weapon.
9 new ministers join Modi govt; 4 elevated as Cabinet mins
Rajyavardhan Singh Rathore replaced Vijay Goel in the Sports Ministry, while also remaining the MoS in the I&B Ministry. The saffron party has also been wooing Christians and his induction is likely to help this cause.
"There is no strike option that is not a war".
China has said it wants denuclearisation but has grown increasingly irate at the United States in the past fortnight, after Washington imposed unilateral sanctions on Chinese companies caught dealing with North Korea.
The hydrogen bomb is the global standard for the five nations with the greatest nuclear capabilities: the US, Russia, France, the United Kingdom and China.
He pointed to the fact that Pakistan - whose nuclear programme is believed to have links with the North's - conducted six nuclear tests in total, and may not have seen a need for any further blasts.
Pyongyang could launch another ICBM in the next few months, Cha said.
Pyongyang, anticipating oil sanctions, has reportedly been stockpiling fuel for months.
Trump's response to North Korea's announcement that it had detonated a hydrogen bomb that could be attached to a missile capable of reaching the mainland United States included an admonishment of South Korea for its handling of the nuclear crisis.
No. 13 LSU runs past BYU in AdvoCare Texas Kickoff
The Cougars fall to 1-1 on the year, and now come home to face arch rival Utah on Saturday at 8:15 p.m.at LaVell Edwards Stadium. True freshman Myles Brennan relieved Etling late in the fourth quarter and completed his only pass attempt for 12 yards.