Hi,

While I do not know where your station is. This looks like a earthquake
signal. I would say a magnitude 3.0+ earthquake at distance of 200+ km.

Best regards,
Jón Frímann.

On mán, 2013-04-22 at 00:23 +0000, Geoff wrote:
> bottom image is of an event just received is both unknown and unusual.
> 
> http://www.amaseistagva.com/current/page3.html
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