A year or so ago I attended a talk on the EarthScope project. You are 
correct the CTBTO would deny ownership of the EarthScope infrasound 
sensor shown in the picture. EarthScope and its portable array are 
unrelated to the CTBTO. The picture does look like a infrasound sensor 
it just does not have the large spatial filter usually used with such a 
sensor. Probably because the installations are temporary. See 
http://www.usarray.org/researchers/obs/transportable/atmospheric
I am in the process of building an infrasound sensor so I have done a 
lot of web reading on the subject. My sensor will have the soaker hose 
spatial filter.
It is well worth reading up on the EarthScope project they have a lot of 
seismometers installed in the US.
Jim Hannon

On 3/8/2013 9:35 AM, chrisatupw@....... wrote:
> From: Dale Hardy 
> To: 'Colin Stuart' ; 'Wolfgang'
> ; 'Bonnie Wickman'
> ; 'John Harris' ;
> 'Victor Dent' ; Andre Phillips
> ; psnlist 
> Sent: Tue, 5 Mar 2013 22:05
> Subject: Waves Generated by Russian Meteor
>
> The National Science Foundation-has published an article on the meteor
> that landed near Chelyabinsk, Russia.
> http://www.nsf.gov/news/news_summ.jsp?cntn_id=127114&org=NSF&from=news
>
> Hi Dale,
>
>      Thanks for bringing this bit of 'journalese' to our notice
> ---> the NSF press release 13-034 !
>
>       I wonder if the NSF could use a new journalist - one that
> actually bothers to check their facts ? !
>
>     Quoting seismic 'pressure' waves :
>     'Waves in the ground travel quickly at about 3.4 km / sec.'
>
>      Well, NO they DON'T ! The velocity is about 6 km / sec down to
> the Moho at roughly 10 km under the oceans and 35 km under the
> continents. In the Mantle, the velocity is 8.2 km / sec at the top and
> 13.5 km / sec at the bottom. The outer core varies from 8 to
> 10.5 km / sec and the inner core from 9.5 to 11.5 km / sec.
>     The transit time that you observe depends upon the ray path.
> Look at the average travel/time graphs for seismic waves at :-
> http://neic.usgs.gov/neis/travel_times/ttgraph.html
>
>      Regarding Infrasound Detectors, a photo, reputedly supplied by
> Iris, is entitled :-
> 'Sensor at an EarthScope TA station.'
>      I suspect that the CTBTO would probably deny ownership ! This
> seems to be a wreck - or is it not an Infrasound Sensor ? Did a
> farmer plough it up ? And it is unlike ANY photos of CTBTO sensor
> arrays that I have ever seen ! There are lots of GOOD photos of
> Infrasound Systems on the www ! See
> http://science.kqed.org/quest/2013/02/21/infrasound-takes-a-bow/
> It took me less than 10 seconds to find this - thanks to Google.
>
>     Regards,
>
>      Chris Chapman
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>

-- 
WB0TXL
WEB Page http://www.ocrslc.net/
Blog http://jimhannon.wordpress.com
CoCoRaHS station IA-LN-7
42,11.90N,91,39.26W


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