Tracking North Korea's nukes
North Korea is a notoriously closed society, so how is it we know when they've tested a nuclear weapon? The Internet, of course. The U.S. Geological Service's Earthquake Information Center keeps an automated, up-to-the-minute, list of seismic events of more than 2.5 magnitude on its Web site. The page does not automatically refresh, so hit F5 on your keyboard to get the latest list if you leave the site up for an extended period of time. The data from the quake, including its magnitude, time, and very specific location are recorded automatically.
The first North Korean test on Oct. 8, although small by nuclear weapons standards (about 1/12th of the Hiroshima bomb) still registered as a 4.2 magnitude seismic event. It showed up within minutes. Similarly, when the Japanese broadcast network NHK reported last week that North Korea may have detonated a second nuclear weapon, we were able to go to the site, and seeing no evidence of seismic activity, question the report.
Of equal importance is the location data. It is very specific. Using either Google Earth or satellite photos provided to our graphics department, we can determine the precise location very quickly.
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