Updated information on DPRK's test

The Preparatory Commission of the Comprehensive Test Ban Treaty Organisation released an updated estimate on the seismic activity detected in North Korea on the 12th of February. The organisation’s earlier estimate was informed by data collected from at least 25 stations that initially detected the tremor. The new analysis incorporates data from 96 international monitoring stations and slightly changes the estimated magnitude of the seismic activity from 5.0 to 4.9. The new estimate will lead to a re-assessment of the likely yield of the explosion whose value partly depends on the detected magnitude of the tremor. New analysis also confirms earlier information about location which corresponds to the location earlier identified for DPRK’s tests in 2006 and 2009.  The new estimate, however, decreased the margin of error for the current location estimate to +/- 8.1 km. Absent on-site access to the testing site, detection of radionuclide particulates or certain noble gases can possibly confirm the nuclear nature of the explosion. New information released by the Preparatory Commission of the Comprehensive Test Ban Treaty Organisation did not refer to any findings of that sort. Detection of these materials depends in part on the effectiveness of measures taken to contain the underground explosion but also on meteorological conditions that influence how long it takes for these materials to reach remote monitoring stations.

Last changed: Feb 15 2013 at 6:28 PM

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