A great analysis by Alex Wellerstein at The New Yorker:
A Hydrogen Bomb by Any Other Name
At ten in the morning on Tuesday, Pyongyang time, a mountain in northeastern North Korea shuddered. Seismographs in nearby countries picked up the telltale signs of moving earth. These signals, and their source, suggested to many observers that the tremor was a non-natural event. Not long afterward, the North Korean government announced that it had not only tested a nuclear weapon, as was already suspected, but that it was the country’s first “H-bomb test,” and that it had been “successfully conducted.” The skepticism from Western experts came swiftly. The power of the explosion seemed on par with the largest of North Korea’s previous tests—the equivalent of around ten kilotons of TNT. But hydrogen bombs are typically measured in the hundreds or thousands of kilotons. Was this a bluff, an exaggeration, or something else?
A long and readable article - Alex covers some of our bomb development history as well as a good analysis of North Korea's capabilities.
Alex also writes the blog: Restricted Data - The Nuclear Secrecy Blog and is the creator of the ever popular NUKEMAP
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