## PSN-L Email List Message

**
Subject: Integrating in WinQuake**

From: RSparks rsparks@..........

Date: Sun, 22 Nov 2009 12:50:35 -0800

Hello Larry,
I will begin by saying thanks for making WinQuake available to all
us amateur seismometer makers. It is a great program that greatly
enriches the hobby.
For some reason, I got to thinking about the difference between
acceleration and velocity detectors today, maybe prompted by your
comment (a few days ago) about using WinQuake to double integrate the
data to convert acceleration data to displacement data. The problem is
that WinQuake (so far as I can determine) does not allow double
integration of the data. Only one integration operation is allowed.
Why does this matter? Until today, I had concluded that my
magnet-coil detection system was a velocity system that only needs one
integration to convert to displacement. But today I thought about what
happens if my seismometer (a vertical) was placed on a rocket that
boosted to a steady velocity. My seismometer would only detect the
acceleration, not the steady state velocity. Hence, my detector must be
an acceleration device. Thus I have a logical reason to do the second
integration of data.
I have tried to devise a work-around but apparently Winquake looks
at the data operations recorded on the data file and locks out further
integration if one has already been performed.
Thanks in advance for any comments,
Roger
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