On 21/02/13 08:59, Steinar Midtskogen wrote:
> Thomas Dick  writes:
>
>> Could I suggest you look at my Facebook post.....not sure if I am
>> right but this site seems to correlate ....
>> https://www.facebook.com/home.php
>>
>> and toward the bottom of my page
>> .... https://www.facebook.com/thomas.p.dick there is a Russian
>> helicorder gif and some comments on this subject....was I on the right
>> track
>
> Is it because I'm unfamiliar with Facebook that I don't see your post,
> or is the post only visible to friends?
>
> Yes, as someone said, it's an atmospheric event, but isn't there a
> possibility that geophones could pick that up?  The infrasound will
> make the ground shake, but I'm not sure if that would happen 1000+ km
> away from an event like this.
>
> My geophones are 3000 km away, but unfortuneatly the arrival of the
> infrasound occurred precisely at the time of the morning activity in
> our house, so even if there is a weak signal there, it's hard to find
> because of local noise.

I think it would be largely below the frequency response of most geophones. Not 
too sure whether it would couple well enough to the ground to overcome the 
noise either.

> https://www.youtube.com/watch?v=H-8ij80vs1E

> http://www.ctbto.org/press-centre/press-releases/2013/russian-fireball-largest-ever-detected-by-ctbtos-infrasound-sensors/



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