Earthquake Detected Near North Korea Nuclear Test Site; China “Suspects Explosion”
However, in analyzing the same earthquake, South Korea came to a different conclusion, and said it was likely to be natural or man-made such as a nuclear test. South Korea’s weather agency assessed the seismic activity as a natural event.
“The quake is presumed to have occurred naturally,” an agency official said, according to South Korea’s Yonhap news agency. “A sound wave, which is usually generated in the event of an artificial earthquake, was not detected.”
Furthermore, all of North Korea’s previous six nuclear tests registered as earthquakes of magnitude 3.9 or above. The last test on 3 September registered as a 6.3 magnitude quake. A secondary tremor detected after that test could have been caused by the collapse of a tunnel at the mountainous site, experts said at the time.
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