PSN-L Email List Message
Subject: Re: Large Response Coming in Now at 18:00 UTC
From: Brett Nordgren brett3nt@.............
Date: Mon, 03 Aug 2009 19:56:52 -0400
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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