PSN-L Email List Message

Subject: Re: NEVADA EVENT ??? M2.7 ??? seen in Apache Junction ??
From: Geoffrey gmvoeth@...........
Date: Sun, 8 May 2011 14:49:08 +0000


It looks like TUC saw the same thing.

It is odd but I am unable to get a flat velocity response cheaply.

I guess my waveform is displacement below 1 Hz
and Acceleration Above 1Hz,
Only right at 1Hz might you call it velocity.

What kind of seismometer is that ?

geoff

-----Original Message----- 
From: Richard Webb 
Sent: Sunday, May 08, 2011 2:32 PM 
To: psnlist@.............. 
Subject: Re: NEVADA EVENT ??? M2.7 ??? seen in Apache Junction ?? 

geoff,

Here is a link to realtime displays.  There are locations near you that 
you could use for a reference.  
http://earthquake.usgs.gov/earthquakes/helicorders.php

Dick


On 5/8/2011 10:21 AM, Geoffrey wrote:
> Hello World,
>
> Could Someone please look at the
> following event to confirm or deny
> that I have actually received a 2.7
> from over 400 miles away ??
>
> Just Posted to PSN events AS:
> [GVA]: 110508.095400.hs-10b.psn  [Mag2.7_UTAH_2011May08_11:32:44_UTC]
>
> I have looked at this event carefully and can not say
> it is not real.
>
> If this be so I believe what I found wrong with my preamplifier.
> Simply, Do not filter within the very first stage if using
> the geophone on the negative input. The feedback will
> not be right to the geophone if you filter the feedback.
> such a thing will decrease receiver sensitivity, or so it seems.
>
> Prosit,
> geoff
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