Sensors all over the world seem to have detected it.  I believe that 
everyone uses the same world-wide array of sensors to listen for 
nuclear events.
http://www.ctbto.org/press-centre/press-releases/2013/russian-fireball-largest-ever-detected-by-ctbtos-infrasound-sensors/

Here's one about having used seismometers in California to help 
analyze sonic pressure waves from the Space Shuttle.
http://l2a.ucsd.edu/pub/eval_infra_atlantis.pdf

Dave's broadband instrument near Los Angeles would see these whenever 
the Shuttle was landing at Edwards on a flight path that passed nearby.
http://bnordgren.org/seismo/gif_images.htm
(Current real-time, not the Shuttle)

Brett

At 06:55 AM 6/28/2013, you wrote:
>Like everybody else, the Russians very likely have arrays of 
>geophones for listening for nuclear testing going around the world. 
>Those arrays data would be coherent...ie timing accurate.

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