PSN-L Email List Message

Subject: Re: Korean nuclar test
From: Canie canie@...........
Date: Sun, 08 Oct 2006 22:00:01 -0700

It appears they have done the test -  (about 9:50pm 10/08/06 -

An official at South 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

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