PSN-L Email List Message

Subject: Why we like verticals
From: Brett Nordgren brett3nt@.............
Date: Sun, 06 Oct 2013 14:22:20 -0400

Hi All,

Dave N. has been playing with an old Guralp 24-bit digitizer, 
attempting to make it work in a predictable manner.  Yesterday he 
hooked it up to his Trillium 120 to do some testing and today he 
recorded a quake that I think he said was a 4-something in Mexico, 
though I don't seem to find it on the USGS site (such as it is).

It gives one of the best illustrations I have seen recently of why we 
prefer verticals for quake watching.  The top trace is the vertical 
axis and the other two are horizontals from the same bedrock-mounted 
instrument.  The quake is difficult to see above the noise on the 
horizontals though it shows up nicely in the vertical channel.  From 
what I can see of the LA weather I think the wind may have been 
blowing pretty strongly.



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