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Korea Utara Sukses Mengujicoba Tes Nuklir Bawah Tanah Ke-3
North Korea says it conducted new, more powerful nuclear test

Hong Kong (CNN) -- North Korea said Tuesday that it had conducted a new, more powerful underground nuclear test using more sophisticated technology, jolting the already fragile security situation in Northeast Asia and drawing condemnation from around the globe.

It is the first nuclear test carried out under the North's young leader, Kim Jong Un, who appears to be sticking closely to his father's policy of building up the isolated state's military deterrent to keep its foes at bay, shrugging off the resulting international condemnation and sanctions.

It also provided a provocative reminder of a seemingly intractable foreign policy challenge for President Barack Obama ahead of his State of the Union address later Tuesday.

"The test was carried out as part of practical measures of counteraction to defend the country's security and sovereignty in the face of the ferocious hostile act of the U.S.," the North's state-run Korean Central News Agency (KCNA) said, referring to new U.S.-led sanctions on Pyongyang in the wake of a recent long-range rocket launch.
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The nuclear test Tuesday, which follows previous detonations by the North in 2006 and 2009, had greater explosive force and involved the use of a smaller, lighter device, KCNA reported.

North Korea's nuclear program is shrouded in secrecy, so it's almost impossible to independently verify many of the details of the test. But its claims play into fears among the United States and its allies that Pyongyang is moving closer to the kind of miniaturized nuclear device that it can mount on a long-range missile.

Despite the North's claims of progress Tuesday, analysts say they believe it is still years away from having the technology to deliver a nuclear warhead on a missile.

"This test isn't going to do that in and of itself, but it is a significant step forward," said Mike Chinoy, a senior follow at the University of Southern California's U.S.-China Institute.

Condemnation from world leaders

After Pyongyang confirmed it had gone ahead with the test in defiance of international pressure, world leaders responded with condemnation.

"This is a highly provocative act" that threatens regional stability, breaches U.N. resolutions and increases the risk of proliferation, Obama said in a statement.

"North Korea's nuclear weapons and ballistic missile programs constitute a threat to U.S. national security and to international peace and security," he said. "The United States remains vigilant in the face of North Korean provocations and steadfast in our defense commitments to allies in the region."

Obama called for "further swift and credible action by the international community" in response to Pyongyang's actions.

"It is a clear and grave violation of the relevant Security Council resolutions," the office of Ban Ki-moon, the secretary-general of the United Nations, said in a statement referring to the test.

The United Nations Security Council will meet in New York on Tuesday morning to discuss the development, a security council diplomat said, declining to be identified because of U.N. protocol on such matters.

Japanese Prime Minister Shinzo Abe said the test was "extremely regrettable," adding that Tokyo would "strongly" protest it.

Seismic activity

U.S. seismologists reported a disturbance on Tuesday morning in North Korea centered near the site of the secretive regime's two previous atomic blasts.
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The area around thepicenter of the tremor in northeastern North Korea has little or no history of earthquakes or natural seismic hazards, according to U.S. Geological Survey maps.

The disturbance reported Tuesday had a magnitude of 5.1 -- upgraded from an initial estimate of 4.9 -- took place at a depth of about 1 kilometer, the USGS said.

Kim Min-seok, a spokesman for the South Korean defense ministry, said the magnitude of the "artificial tremor" suggested the size of the blast could be in the order of 6 to 7 kilotons, more powerful than the North's two prior nuclear tests.

That calculation, though, was based on the USGS's initial estimate of a 4.9-magnitude seismic disturbance, he said. A 5.1-magnitude tremor could indicate a 10 kiloton explosion.

The China Earthquake Network Center said on its website that the seismic disturbance in North Korea was a "suspected explosion."

News breaks at a quiet time in Asia

The test took place at a time when several East Asian countries, including China, North Korea's major ally, are observing public holidays for the Lunar New Year, which began Sunday.

It also comes ahead of the birthday on Saturday of Kim Jong Il, the former North Korean leader who died in December 2011 and was succeeded by his son, Kim Jong Un.

North Korea announced last month that it was planning a new nuclear test and more long-range rocket launches, all of which it said were part of a new phase of confrontation with the United States.

It made the threats two days after the United Nations Security Council had approved the broadening of sanctions on the reclusive, Stalinist regime in response to the North's launching of a long-range rocket in December that succeeded in putting a satellite in orbit.

Pyongyang said it carried out the launch for peaceful purposes, but it was widely considered to be a test of ballistic missile technology.

U.S. analysts say North Korea's first bomb test, in October 2006, produced an explosive yield at less than 1 kiloton (1,000 tons) of TNT. A second test in May 2009 is believed to have been about two kilotons, National Intelligence Director James Clapper told a Senate committee in 2012.

By comparison, the bomb the United States dropped on Hiroshima in 1945 was a 15-kiloton device.

In May 2012, North Korea said it had amended its constitution to formally proclaim itself a "nuclear state."

http://edition.cnn.com/2013/02/11/wo...nce/index.html

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