PSN-L Email List Message

Subject: Re: STM's VBB equations
From: Brett Nordgren Brett3kg@.............
Date: Fri, 03 Mar 2006 07:37:07 -0500


If you haven't already, you may want to look at some of my data on

In particular, the files  'loop3.pdf', 'lpmeas2.pdf', and probably some others.
If you can provide some more details, I'll be happy to try to help.


At 07:26 PM 3/2/2006 -0800, you wrote:
>Hi All
>    I have constructed 3 long period seismographs which used info from 
> STM's web site. They work well. What isn't working well is duplicating 
> STM's equation results for the sensors response. I have tried my DOS 
> version of mathcad and have just created the equations in Excel. I get 
> the same results with both. However they differ from that  STM got and 
> also Al Coleman. I have been able to duplicate most of their results 
> except for the response slope at both ends of the velocity graph, 
> especially at the low end. My graphs drop off too dramatically. Has 
> anyone run the equations and duplicated STM's results with his 
> seismograph characteristics? I am an engineer and understand equations. I 
> suppose that I'm not reproducing some subtle portion of the equations, 
> though I have stared at them for days.

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