PSN-L Email List Message

Subject: RE: ebay auction
From: John or Jan Lahr JohnJan@........
Date: Sun, 14 Aug 2005 13:53:11 -0700

Hi Kareem,

Without strong filtering to enhance the longer periods, this unit would be
unable to see teleseismic surface waves.  The filter/amplifier that is sold
with the AS1 does manage to pull out larger surface waves.

After a large event, check out the records posted here in near-real time:
(Many school stations are not operating during the summer.)

The Sumatra records are posted here:
and records from a 6.7 in the Cayman Islands here:

Often when a long period instrument picks up clear 20-second surface
waves the AS1 will only see waves in the 12- to 15-second range.


At 11:58 AM 8/14/2005, you wrote:
>This particular unit is more suited for local event records, right?
>-----Original Message-----
>From: John or Jan Lahr [mailto:JohnJan@.........
>Sent: Sunday, August 14, 2005 10:53 AM
>To: psn-l@..............
>Subject: Re: ebay auction
>The AS1 works amazingly well for such a simple mechanical system with moving
>I've posted information here on the system:
>However $150 is quite steep for a used transducer without
>amplifier/filter/AD unit.


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