PSN-L Email List Message

Subject: Re: Earthquake or a noise ?
From: "Geoffrey" gmvoeth@...........
Date: Mon, 29 Jan 2007 18:01:12 -0700

Hello Mr. Frímann;

I was just going by the fact the groups of
signals in your data appear to have
both slow attacks and slow decay
that make me think they are caused by something
approaching and departing the sensor area.
Attack and Decay are terms used in music
to describe a tonal envelope.
Earthquakes that I see almost always have a
sharp attack being practically instantaneous.
There is only one place i get odd P waves from
that slowly raise out of the noise and that
seems to be signals from the Gulf of California
in Northern Mexico.


----- Original Message ----- 
From: "Jón Frímann" 
Sent: Monday, January 29, 2007 5:08 PM
Subject: Re: Earthquake or a noise ?

> Hi all
> I still want get a opinion on this so I know if this is a earthquake or
> a noise of a unusual type.
> Geoffrey
> The area where I live doesn't have many earthquakes over the year
> (Nearby 70 - 300 Km, depending on direction), maybe 5 to 10 earthquakes
> if it is a busy year and that only happens like every 5 - 10 years or
> so. Not even that often. If this is a earthquake, it is quite unusual
> for me to see it at this close distance to my location. But that might
> just be because I have just had this station such a short time here.
> Regards.
> -- 
> Jón Frímann
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