PSN-L Email List Message

Subject: Re: Guatemala earthquake
From: John Lahr johnjan@........
Date: Wed, 13 Jun 2007 21:59:32 -0700

Hi Martin,

The Guatemala event was recorded quiet well by the AS-1 instruments in the US.

I think that Beal school did record the event but they will need to 
run a low pass filter with a corner of about 12 seconds to bring out 
the longer periods.  Within the event window, this filter can be 
applied twice to even more greatly reduce the higher frequency noise.

For some reason the coordinates that they provide at the top of their 
seismogram page don't agree with those entered into AmaSeis, and it 
would be helpful to install the latest version of AmaSeis.

They got a very good recording of the recent, rare event near Kent.


At 09:36 PM 6/13/2007, you wrote:
>Hi Jon,
>      The Guatemala quake signal was suprisingly small for a 6.8 - 
> 6.9  event. I registered about 2.5 to 3 times the background level, 
> that's for a vertical broadband operating at 0.1 to 0.05 Hz 2nd 
> order Butterworth.
>I note that Beal School recorded nothing and the BGS is not 
>particularly great in amplitude for an event of this magnitude at a 
>distance of 10500Km.
>Regards Martin


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