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ibusinesslines.com April 26, 2018


Small Quake Rattles North Korea Nuclear Testing Grounds, Not Manmade: South Korea

13 October 2017, 11:42 | Erica Roy

Small Quake Rattles North Korea Nuclear Testing Grounds, Not Manmade: South Korea

Small Quake Rattles North Korea Nuclear Testing Grounds, Not Manmade: South Korea

South Korea has detected a fourth small quake near North Korea's main nuclear test site after the country's sixth and most powerful nuclear test explosion last month. The seismic experts and a United Nations nuclear test ban watchdog had referred to the tremor on September 23 as an aftershock of the North's sixth and largest nuclear test.

The US Geological Survey assessed it to be of 2.9 magnitude, originating 23 kilometers northeast of Sungjibaegam, Ryanggang Province, in North Korea. These have prompted experts and observers to suspect the last test may have destabilized the mountainous location. "If it goes ahead with another test in this area, it could risk radioactive pollution".

The North's latest nuclear experiment, which it claimed involved the test of a hydrogen bomb, generated seismic waves of 5.7 magnitude, according to the Korean authorities, or 6.3 magnitude based on the US' analysis.

The magnitude of the test was much lower than the North's most recent nuclear test on September 2, which measured 6.3 on the Richter scale.


The explosion from the sixth test was large enough for residents of the Chinese border city of Yanji, 200 km (125 miles) north of North Korea's nuclear test site, to feel the ground shake beneath their feet.

The area is considered stable and quakes do not normally occur there. However, the South Korean experts have said that the tremor did not appear to be man-made. This second tunnel may have caved in after the sixth test, the intelligence officials said. On September 3, Pyongyang announced a successful test of a hydrogen bomb.

There are no nearby tectonic plate faultline boundaries to the test site. In 2006, North Korea's first detonation triggered a 4.1-magnitude quake.



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