In depth analysis: North Korea

The Project for the CTBT has a calculation from Martin Kalinowski:

The U.S. Geological Survey readings indicate a seismic body wave of magnitude of 4.7, which is larger as compared to the value of 4.1 ± 0.1 in 2006. According a preliminary assessment by Martin Kalinowski of the University of Hamburg, this corresponds to an explosive yield of about 3 to 8 kilotons TNT equivalent with a most likely yield of 4 kt. In 2006. The yield of the 2006 test explosion was approximately 0.5 to 0.8 kt TNT equivalent.

Here is Kalinowski's fact sheet.

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Labels: North Korea, Nuclear Test