PSN-L Email List Message

Subject: Re: Meteoroid ?
From: "Geoff" gmvoeth@...........
Date: Tue, 29 Apr 2008 10:56:03 -0700

I find it odd that an air explosion would
cause a ground trace of that nature.
Maybe someone can tell us what past
air explosions have looked like.

I would expect a meteor impact to look
like a mine blast giving upward
motion at first arrival
all around the impact point.

As for an air explosion
would you see both P and s waves
since air is a fluid and propagates
no such S waves unless they form
on contact with the Earth.

Anyone have examples of air blast
seismic signatures ?

----- Original Message ----- 
Sent: Tuesday, April 29, 2008 5:38 AM
Subject: Meteoroid ?

> Hi all
> I was speaking to an seismologist at IMO about the "earthquake" that
> happen the 25th April around 07:40. He did suggest that it was a Meteoroid
> rather then a earthquake, as the event was recored on most seismic
> stations in Iceland around the same time. He did suggests that this was an
> earthquake, but given the clues it seems unlikely. If this was a
> meteoroid, it is mostly likely that it did exploit high up in the
> atmosphere. But no explosion has been reported so far, but the area where
> this most likely did happen is unpopulated for most part. This was closer
> to Greenland then Iceland, it appears.
> I did also record this event and the trace can be seen here.
> This is a filtered trace at 2Hz (I think, don't remember what I did filter
> it on).
> It would be nice to get a different opinion on this.
> Regards.
> Jón Frímann.
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