PSN-L Email List Message

Subject: Re: Large Response Coming in Now at 18:00 UTC
From: "tchannel" tchannel@............
Date: Mon, 3 Aug 2009 18:28:52 -0600


Hi Brett,  How do I set up WinSDR or Winquake to view as  movement?   ( I 
recorded 2.6 mm of movement on the vertical channel)

Thanks, Ted


----- Original Message ----- 
From: "Brett Nordgren" 
To: 
Sent: Monday, August 03, 2009 5:56 PM
Subject: Re: Large Response Coming in Now at 18:00 UTC


> Bob
>
> Now that I corrected the y-scale the plot from our vertical 
> http://bnordgren.org/seismo/090803.175000.bhz-pl.psn.gif  shows roughly 
> 3mm/s peak,  which agrees pretty well with the values (assuming you meant 
> mm/s) that you were seeing.  This is from near LA which is at about 6.5 
> deg.  It's interesting that if you assume the predominant frequency was 
> 1/13 seconds, that should imply that the vertical ground motion at Dave's 
> vault was about 6.2mm peak or 1.24 cm p-p.  That's a lot of motion!
>
> For laughs, I uploaded the output from the high gain channel 
> http://bnordgren.org/seismo/090803.175000.bhz-ph.psn.gif which clips at 
> 300um/s and indeed it clipped.  However, the low gain channel should be 
> able to handle up to 1.5cm/sec peak.
>
> Brett
>
> At 11:28 AM 8/3/2009 -0700, you wrote:
>>There are two events, the first one if listed as M 5.8, the second event 
>>is M 6.9.  I recorded 2.6 mm of movement on the vertical channel, 3.8 mm 
>>on the North channel, and 2.0 mm of movement on East channel.  My station 
>>is only 3.43 degrees (381.14 km) from the event.
>>
>>Bob Hancock
>
>
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