See this though...http://www.freerepublic.com/focus/news/3467419/posts?page=15#15
Will look at it. Thanks.
Will look at it. Thanks.
I did some cursory research on the topic, and basically without information regarding the nature of the test (depth, etc), converting the Richter number to KTs is pretty much guesswork.
The type of rock (granite, sedimentary, etc) makes a big difference in the yield estimate, as does the depth of the explosion, neither of which are known.
The initial measurement from the South Korean seismic station indicated a depth of 0 meters (with unknown error estimate), which means the explosion might have even taken place on the surface.