North Korea detonated in atomic device, testing the first two test the United Nations agency said, it is prepared to confirm when the blast happened. But experts say, it may be difficult to determine whether the nature of the nuclear blast.
The best test index is seismic tremor and gases released into the air of the phenomenon, from the previous test to determine the comprehensive test ban treaty "organizing committee.
The vienna-based organization of the most effective testing tool, worldwide in more than 150 seismic station. Although the yield is very small, north Korea in 2006, the first test selected comprehensive test ban treaty organization, in 2009 the second test.
Last week, north Korea warned that it plans to the third nuclear test, to protest the toughening to punish it emission long-range rocket in 12 months of international sanctions. The launch of the world see for ballistic missile test, the United Nations has forbidden, and Pyongyang said, as a peaceful space development part of the program, it launched a satellite into orbit.
The United States, South Korea and their Allies already by north Korea to give up its nuclear program, saying it will only aggravate the country for decades international isolation.
Threat is positioned in the south Korean scientists and experts high alert, any test may increase tension on the Korean peninsula.
South Korea's defense ministry says it believes north Korea nuclear test preparation has been completed, confirm satellite us-korea institute, John Hopkins university senior international research institute is a research group analysis last week.
The American secretary of state Hillary Clinton said Tuesday JinZhengYun new leader attention the leadership of the north Korean regime to take a series of action.
"Let me express my regret, because I think a new young leader, we all the different things, and we hope he focus on the betterment of the north Korean people's life, is not just elite, but everyone is expected to have more education, more open, more opportunities," she said, in the city hall type meeting in Washington. ", on the contrary, he has been engaged in a very aggressive words and actions.
Satellite images of the Punggye website - the first two test - show that north Korea may have been sealed in the tunnel into the mountain will be detonated a nuclear device.
In this underground nuclear test, whether comprehensive test ban treaty organization in South Korea facilities and earthquake monitoring station can detect seismic tremor.
However, although this is a powerful test shows that it is not an absolute confirmation.
In the state of South Korea weather bureau earthquake experts say, his office purpose is to find a huge tremor, it began to time, in ten minutes on the map the explosion of the exact location. He did not wish to be named, speech, because he was not authorized to speak to the media.
Experts also pointed out that the artificial earthquake, such as a nuclear blast, and few trigger the same natural seismic wave mode,.
North Korea can still try to cheat, gives the impression of, it exploded a nuclear device, through the simple explosion advanced conventional weapons, will trigger the same test, seismic waves generated in government funded Korea institute earthquake experts say, wisdom Heoncheol earth science and mineral resources.
So by raising tensions, north Korea may wish to take returns promised preferential or assist in the unproved nuclear capabilities.
"Even if they bring high power conventional explosive truck, introduce them underground tunnel and exploded, will produce the same seismic waves, sound waves, mentally said." The only difference is that no radioactive substances can be detected conventional weapons explosion, he said.
Of course, the best scientists will collect the air sample, looking for increase the radiation, but this process may take several days. Even if the wind is favorable - and assume that north Korea test Punggye - RI in the country's northeast corner - it will be more than a day in the air the radioactive isotope like xenon to South Korea, according to a government official running nuclear security and nuclear safety committee.
The official, who asked not to be named theme quoted sensitive nature, admit that it may be impossible to South Korea, to confirm the test, and if the wind does not blow to the south Korean plug, or if the underground tunnel so close, no radioactive gas leaked event.
South Korea and in Vienna comprehensive test ban treaty organization confirmation, north Korea's nuclear radiation level increase, but in 2009 and found nothing.
Comprehensive test ban treaty organization spokesman Annie card · pass fort said, in general, it is difficult to conduct a nuclear test to control the escape of inert gas, it is a clear indication of the nuclear test. She organization of a wide range of air sampling network, it is not dependent on the direction of the wind, than Korean in determining such trace.
If north Korea decided to make the so-called subcritical test, will be in all the radioactive release - but may be beyond northland professional knowledge.
The subcritical test plutonium properties, but applies only to create a critical mass, took place in a self sustaining reaction stopped short. Such experimentation requires a "very difficult technology, only the United States, Russia and Britain and a few countries have obtained nuclear experts said, WangHaiZhu hao kyung hee university.
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"I believe that north Korea's technology haven't reached this level," wang said.
North Korea says the upcoming release of the atom bomb would be a "high level" test, many analysts say, refers to a by highly enriched uranium, which give the country's second source in addition to the plutonium bomb-making equipment.
Whether north Korea detonated uranium and plutonium based equipment, won't have too big difference, how easy, scientists can detect test. The only difference is that they produce different radioactive gas, wang hai said.
He also said it would mean that north Korea's nuclear reserves can continue to expand, is there evidence to prove that in the main yongbyon nuclear facilities continue to produce plutonium uranium based test explosion.
In South Korea north Korean observers guess every possible test dates, and some predictions may happen, earlier this week, the choice of the day before February 16 late north Korea's leader Kim jong il's birthday.




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