Seismologists detected a powerful artificial earthquake at 0030 GMT Friday, which they said was centered around Punggye-ri, North Korea's nuclear test site.
South Korea says it believes the quake was caused by the testing of a nuclear device, with a yield of 10 kilotons. That would make it the most powerful of Pyongyang's five nuclear tests to date.
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| A South Korean soldier watches a TV broadcasting a news report on Seismic activity produced by a suspected North Korean nuclear test, at a railway station in Seoul. |
Why have they carried out another test?
The North Korean leadership says a credible nuclear deterrent is critical to the nation's survival, claiming it is under constant threat from an aggressive United States.
Although it has regularly threatened neighboring South Korea, its main priority is developing a effective strike threat against the U.S. mainland.
It has always insisted it will continue testing, ignoring global condemnation and toughened UN sanctions.
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