Alaskan Earthquakes / North Korean Nukes
The American Mind links to seismographic data in Alaska on September 9th which might corroborate the North Korean nuclear test theory. The recordings were at 08:15 Alaskan time, or 16:15 GMT.
But this page lists three Alaskan earthquakes from 16:08 through 16:24 GMT. So they might have just been earthquakes after all.
UPDATE 4:16 AM: Via this page, look at the difference between a nuclear blast and an earthquake. Notice that with a nuke, the seismogram maxes out immediatley, then gradually fades, whereas with an earthquake there's a gradual buildup:

Now go back to the Alaskan seismograms. Definitely earthquakes.
UPDATE 4:35 AM: For the record, I'm guessing it probably was a nuclear test, even though the information I mentioned earlier seems to contradict that. After-all, there was a large mushroom cloud which left a crater visible from space. Plus there's the fact that we were already anticipating a North Korean nuclear test to happen shortly:
UPDATE 4:47 AM: On second thought, you'd pick up a nuclear test anywhere in the world, with a seismograph, and it's clearly not on the Alaskan seismographs. So what's the explanation for the gigantic mushroom cloud and crater? I really don't know.
Comments
*underground* nuclear tests wouldn't create mushroom clouds.
These clowns blew it up above ground (if it is nuclear)
I'm not saying all nuclear tests would create mushroom clouds. But this event, whatever it was, did create a mushroom cloud.
This sounds like a major communist arms depot or rocket fuel factory going up.
The Soviet North Seas fleet lost it's primary weapons storage depot in the late 1980's when some of its ammunition went up either spontaniously or through incompetence and wiped out 80% of the North Seas Fleet's ammunition.
Being as the majority of it was things like torpedos, cruise missiles, anti-aircraft missiles and rockets. The Fleet never again achieved combat readiness before the Soviet Union fell.
The blast that happened at an American solid rocket plant in the late 1980s or early 1990's was near nuclear in size and it slowed Shuttle and TitanIV launches for six months due to a lack of solid rocket motor fuel.
Why would NoKos test a nuclear device virtually on the border with China? Seems pretty stupid to me.
"Why would NoKos test a nuclear device virtually on the border with China? Seems pretty stupid to me."
I don't think China would interpret it as a threat, whatever it is.
It is impossible to do any energetic activity- rocket launch, explosion-nuclear or conventional, without leaving a signature that can be detected- acoustic, seismic, optical, RF etc by someones sensor. So how do you hide an underground nuclear test- detonate it underneath a large surface blast " we are building a hydroelectric plant" as a cover. By the time the shock waves propagate to the seismometers, they will be mixed and phase shifted that you probably could not separate the two signatures.