PSN-L Email List Message

Subject: Re: Missing clear S wave from local event
From: Geoff gmvoeth@.........
Date: Wed, 26 Dec 2012 07:58:13 +0000

On 2012-12-20 22:33, Tiago A. wrote:
> *Geoff* /gmvoeth@........... /
> /
> Did anyone mention that S waves dont travel throgh liquids like lava
> chambers
> or Liquid Outer Cores ? They can chang from P to S and back again but loose
> energy at each and every velocity boundary.
> /Hi. That was my first thought, but even if the lava chamber is the
> reason, is it so big and the material so liquid to change dramatically
> the earthquake recording?
> The official arrival times for the CMLA station are:
>   P       2012/10/12 04:11:07.6
>   S       2012/10/12 04:11:10.1
>   A       2012/10/12 04:11:12.6
> The origin time is: 04:11:05.5 (4.4km depth)
> Image of location of stations and eq epicenter
> Thanks.
> Best Regards
I think the people you really need to answer such a question
are the Seismic Tomography peoples but there exists the
possibility that since these concepts may be competitive
in that they might be used for oil exploration they might not
be willing to share such information with us amateurs.


I have heard through the grapevine that
NMR machines have classified circuitry
which can not be worked on by anyone
but factory peoples.
NMR is also a tomography concept,
or so i understand.
as well as pet scans.
Industrial competitions are the great
killer for sharing of knowledge
and understanding.
Seismic understandings may also
be governed by the almighty pocketbook.
Im not sure we will be allowed to understand
everything the big boys know.


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