PSN-L Email List Message

Subject: Re: Chelyabinsk
From: Thomas Dick dickthomas01@.............
Date: Wed, 20 Feb 2013 15:24:40 -0600


On 2/20/2013 2:35 PM, Mark Robinson wrote:
> 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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I am not sure what you are talking about but the Blue Angels were here 
several years ago and flew right over my house. I definitely recorded 
them on my units
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