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2013 North Korean nuclear test
On 12 February 2013, North Korean state media announced it had conducted an underground nuclear test, its third in seven years. A tremor that exhibited a nuclear bomb signature with an initial magnitude 4.9 (later revised to 5.1) was detected by the China Earthquake Networks Center,〔(【引用サイトリンク】url=http://www.csndmc.ac.cn/newweb/secondpage.jsp?id=1146 )〕 Comprehensive Nuclear-Test-Ban Treaty Organization Preparatory Commission〔(【引用サイトリンク】url=http://www.ctbto.org/press-centre/press-releases/2013/on-the-ctbtos-detection-in-north-korea/ )〕 and the United States Geological Survey.〔 In response, Japan summoned an emergency United Nations meeting for 12 February and South Korea raised its military alert status. It is not known whether the explosion was nuclear or a conventional explosion designed to mimic a nuclear blast;〔Broad, William, "(A Secretive Country Gives Experts Few Clues to Judge Its Nuclear Program )", ''New York Times'', 12 February 2013. "As is usual with tests by the secretive North, it was not even clear if the underground test was nuclear, rather than conventional bomb blasts meant to mimic an underground nuclear test;"〕 as of two days after the blast, Chinese, Japanese, and South Korean investigators had failed to detect any radiation.
== Test ==
On 12 February 2013, a spokesman for North Korea's army command said it had successfully conducted a third underground nuclear weapons test, according to the Yonhap.〔(【引用サイトリンク】title=North Korea Nuclear Threat )〕 North Korea also said the test had used a miniaturized nuclear device with greater explosive power.
Before North Korea announced they had conducted the test, seismic activity had already been detected in North Korea by the United States Geological Survey (USGS) and the seismic network operated by the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) Preparatory Commission, near the site of previous nuclear tests at Mantapsan in Kilju County. A large tremor, first estimated at magnitude of 4.9, was detected in North Korea, and governments in the region were trying to determine whether it was a third nuclear test. The USGS upgraded the magnitude of the possibly nuclear tremor from 4.9 to 5.1, located east-northeast of Sungjibaegam, North Korea. The tremor occurred at 11:57am KST (2:57am UTC), and the USGS said the hypocenter of the event was only one kilometer deep. Later, the Geophysical Service of the Russian Academy of Sciences did not register any seismic events and underground tremors at 16:00 local time on 12 February 2013, in the Russian Far East.〔("Russia says no danger to Far East residents over North Korea's nuclear test" )〕 The China Earthquake Networks Center (Abbreviation: CENC; ) also reported this event, putting the magnitude at Ms 4.9.〔 The tremor caused by the test could be felt by residents of the neighboring city of Hunchun and Antu, in Yanbian, Jilin Province, China. A citizen of Hyesan, Ryanggang Province of North Korea, west from the nuclear test site, reported that many 5- and 7-floor buildings shook very severely, and this caused cracking. The explosion was registered by 94 seismic stations and two infrasound stations in the CTBTO’s global monitoring system. The CTBTO radionuclide network later made a significant detection of radioactive noble gases that could be attributed to the nuclear test.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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