North Korea conducts apparent nuclear weapons test

Kirk Spitzer, USA TODAY9:47 p.m. EDT September 8, 2016

TOKYO - North Korea appears to have conducted a nuclear weapons test early Friday, the Yonhap News Agency reported.

If confirmed, it would be North Korea’s fifth nuclear weapons test since 2006, all in violation of UN resolutions.

Earlier, South Korea’s weather service reported that it had detected an “artificial earthquake” in North Korea.

September 9 is the anniversary of the founding of the Democratic People’s Republic of Korea in 1948.

South Korea's Joint Chiefs of Staff said in a statement that "artificial seismic waves" measuring 5.0 were detected near the Punggye-ri test site, and officials were analyzing whether it was a nuclear test, the Associated Press reported.

European and U.S. monitoring services also detected similar seismic activity, with theU.S. Geological Survey calling it an "explosion" on its website.

North Korea conducted its fourth nuclear test earlier this year, part of its push for a nuclear-armed missile that could one day reach the U.S. mainland.

And here is Thad Jackson's paper examining some of the impacts of past North Korean nuclear weapons' related tests. The paper is also on SSRN.