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Go Back   Armchair General and HistoryNet >> The Best Forums in History > Military/History Related Hobbies > Research, Reference and Historical Study > Science

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Science Discussions about hard science.

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  #16  
Old 11 Sep 17, 08:08
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Quote:
Originally Posted by MarkV View Post
No it only creates a localised set of tremors. It does create seismic shock waves that specialised equipment can can detect halfway round the world but those are not earthquakes any more than the ones that oil exploration companies create almost daily using conventional explosive are. And it would only start a San Andreas Fault quake if a] it was deep enough and b] pressure had already built up inside the fault over time (you don't get major earthquakes every day) compared to the energy released by a big quake even an H bomb is puny. It might be able to trigger one if one was due. It is fortunate for us humans that big quakes usually have their epicentres really deep down.
If the seismic waves (induced seismicity, man-made earthquakes) were only a "localized set of tremors," they wouldn't be detecable by seismometers (specialist equipment) on the other side of the world.

The Human Chia Pet's most recent nuclear test registered as a magnitude 6.3 earthquake on USGS "specialist equipment" on the other side of the world. The quake was felt over a wide area...



https://earthquake.usgs.gov/earthqua...aert#executive
North Korea shaken by strong tremors in likely nuclear test
  • North Korea was shaken by as many as two strong tremors on Sunday, with the South's officials saying it was presumed to be a sixth nuclear test
  • North Korean television later reportedly said it was a successful test of a hydrogen bomb

Leslie Shaffer | @LeslieShaffer1
Published 11:43 PM ET Sat, 2 Sept 2017 | Updated 11:34 AM ET Sun, 3 Sept 2017

North Korea was struck by as many as two strong tremors on Sunday, with the South's Joint Chiefs of Staff saying it was presumed to be a sixth nuclear test.

[...]

The USGS initially reported a first tremor as a 5.6 magnitude, but later raised it to 6.3, while China's earthquake administration said it detected a 6.3 magnitude earthquake in Northeastern North Korea, calling it a "suspected explosion," Reuters reported.

The depth of that quake was recorded as zero kilometers, the China earthquake administration said, according to Reuters.

[...]

https://www.cnbc.com/2017/09/02/nort...t-reuters.html
The Human Chia Pet's apparent H-bomb test yielded 2 "earthquakes"...

The explosion...



And then the collapse of the test chamber...



The charges used for seismic surveys are very localized and undetectable by seismometers more than a few km from the shot.

Last edited by The Doctor; 11 Sep 17 at 13:59..
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  #17  
Old Yesterday, 16:44
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Aftershocks likely from September test...


Quote:
WASHINGTON--Two minor tremors were detected on Saturday from near North Korea's nuclear test site and were probably aftershocks from the country's massive nuclear test in early September, a U.S. Geological Survey official said.

The aftershocks, of magnitude 2.9 and 2.4, were detected at 0613 and 0640 GMT (1:13 a.m. and 1:40 a.m. EST) respectively, said the USGS and Lassina Zerbo, executive secretary of the Vienna-based Comprehensive Nuclear-Test-Ban Treaty Organization.

A tweet from Zerbo said analysts had confirmed that the activity was "tectonic" in origin.

The USGS official said the tremors had been in the vicinity of the Punggye-ri nuclear test site, where North Korea conducted its sixth and largest underground nuclear test on Sept. 3.

Tremors were detected near North Korea’s nuclear test site Saturday, but they are likely aftershocks from the large nuclear test conducted in September, officials said.

The test, which took place Sept. 3, was the country’s sixth and largest underground nuclear test, according to Reuters.

“They’re probably relaxation events from the sixth nuclear test. When you have a large nuclear test, it moves the earth’s crust around the area, and it takes a while for it to fully subside. We’ve had a few of them since the sixth nuclear test,” a U.S. Geological Survey official told Reuters.

There have been a number of tremors felt in the area since the test, prompting experts to think that the mountainous area may have been damaged as a result of the tests, Reuters reported.

http://time.com/5057490/north-korea-aftershocks/
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