
The North Korean Nuclear Test Site
South Korea reports that Kim Jong Un has offered to close North Korea’s nuclear test site at Punggye-Ri in May. He says he will invite US and South Korean experts to examine the site before its demolition to see that it is still usable.
There have been very definite statements from experts outside North Korea that the site may or may not be usable. We don’t have access to the site, so we must surmise the situation from overhead photos, seismic traces, and experience at other test sites.
The yield of the most recent test was very large, perhaps 250 kilotons. It’s hard to estimate the yields of North Korean nuclear tests because we don’t know enough about the geology of the test site. It was followed by three seismic events of 4.6, 3.5, and 2.9 magnitude, which were not tests. Read More