PSN-L Email List Message

Subject: Re: Korean nuclar test
From: apsn apsn@...........
Date: Sun, 08 Oct 2006 21:11:08 -0800

At 09:00 PM 10/8/2006, you wrote:
>It appears they have done the test -  (about 9:50pm 10/08/06 - PDT)
>An official at 
>Korea's seismic monitoring center confirmed a magnitude-3.6 tremor 
>felt at the time North Korea said it conducted the test was not a 
>natural occurrence.
>Australia also said there was seismic confirmation that North Korea 
>conducted a nuclear test.
>At 09:57 AM 10/8/2006, you wrote:
>>Bob--Your interest in the Korean Nuclear Test is a nice challenge to
>>consider.  My only nuke tests copied here in VA years ago were the announced
>>tests in Nevada----They were given a magnitude rating after the event (by
>>the NEIS)--We probably received 10 to a dozen over 2 years -the mid l970's.
>>Mag. 4 barely read--Mag. 5's much better, and several over 6.0 Mag--looked
>>like a typical west coast/Calif. event in good detail.   Travel time on the
>>events was 6 minutes, 10 seconds for us The main signature difference was
>>the obvious lack of a "S" wave, as the detonation was in a small spherical
>>cavity a kilometer or two underground--and appeared as a point source.
>>     I understand some countries attempting tests during the banned times
>>elongated their cavities to create a shear "S" componet in the
>>signature.--and they appeared as a natural event.
>>   Perhaps this background note may be helpful.  I am certain you will find
>>more information on the web pages suggested.  A Mag.5.5 or greater from
>>Korea will be widely copied, no doubt by amateurs as well as professionals--
>>    Have a good day-- Jim Lehman
>Bob Hammond
>Public Seismic Network - Alaska


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