On 9 October 2006, an explosion occurred in North Korea as predicted by that country's press office (Figure 1). The highfrequency P waves relative to S waves allowed easy identification (Richards and Kim 2007a, 2007b). However, estimating the yield of the explosion proved more difficult. Richards and Kim (2007a, 2007b) employed the current procedure for estimating the size of events from inferences from magnitude-yield curves, usually mb or a regional proxy, mb (Lg). Linear plots of mb vs. yield are based on measured mb for known...

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