PSN-L Email List Message

Subject: Fwd: Re: Event file conversion
From: John or Jan Lahr johnjan@........
Date: Tue, 18 Mar 2003 08:34:46 -0700

Date: Tue, 18 Mar 2003 07:27:46 -0700
To: Bobhelenmcclure@.......
From: John or Jan Lahr <johnjan@........>
Subject: Re: Event file conversion

Hi Bob,

Thanks for making your WinDaq to PSN4 conversion program available at this time, because I think there is
quite a bit of interest.  I put the program here:

You can always send updated versions if you make changes in the future.


At 09:09 PM 3/17/2003, you wrote:
Hi John,

  The Rat Island M6.8 event file is attached.  Note that the P wave excites 0.7 Hz vibrations.  I see that frequency all the time.  I get the idea that the subsurface locally is like a bowl of Jell-O which has a natural frequency of 0.7 Hz.  The vertical seismometer shows much less response to this "vibration".  I live on terminal moraine, between two bays.  Bedrock is about 300 feet down.  The LDEO Palisades site doesn't seem to have this problem.  They are close to, if not on, bedrock.  You know better than I do about that.

  As the day has worn on, I have tested all the functions of HeadpikV2, and everything seems to work, so I am attaching a zip file containing the exe, the source code, the operating instructions, and today's event files (both the WDQ and PSN formats).  I am surely pleased that now I can use all the features and universality of WinQuake, and still stick to recording and period-extending filtering with my Dataq devices and software.  I may eventually add an "ini" file to the program, where the use can enter his coordinates, the input direction for each channel, channel name, sensor name, and sensor properties, so that all that doesn't have to be hand-entered everytime one wants to create a Winquake file.  In fact, it is set up for velocity data, and the user of this program can't change that without modifying the source code.  An "ini" file could overcome that handicap, as well as some others.



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