PSN-L Email List Message
Subject: Re: Noobie Greetings
From: "Dewayne" n0ssy@...........
Date: Wed, 17 Jan 2007 08:48:25 -0700
Welcome to the group Michael.
If you want to build a vertical seismometer, look at my design @
http://www.jclahr.com/science/psn/hill/.
I constructed this one about two years ago and it has preformed very well.
My seismometer is also located in my crawl space. I poured a small 4'x4'x6"
concrete pad to set my seismometers on. I used straight
mortar (lots of dust) as it doesn't contain any rocks. I used mortar to
prevent any thermo-dynamic differences between the mortar and rocks
that are in concrete.
I am using an oil dampimg system. I have tried cooking oil, transmisson
fluid and motor oil. All of these are not heavy enough to give a good
damping. My next try is going to be STP oil treatment. If STP don't work
I'll have to redo the tub to something with a larger surface area.
Anyway good luck and have fun.
Dewayne
----- Original Message -----
From: "Michael Kimzey, D.O."
To:
Sent: Tuesday, January 16, 2007 6:51 PM
Subject: Noobie Greetings
> Hi all.
>
> I'm new to the group and just wanted to get my feet wet with a post,
> observations and some questions. After many years of indecision, I
> finally made the plunge and built a Lehman. It is currently operating in
> a crawl space under the family room. I thought that it would be somewhat
> quiet there, but it seems that some poured concrete over dirt isn't that
> quiet. Additionally, I am 50 feet from a fairly busy road...but I'll take
> what I can get.
> With the help of Larry (very helpful and patient with questions), I
> got the electronics up and running and the rest of the story with pictures
> can be viewed at http://www.mckimzey.com/seismology.html I haven't
> seen any activity yet, but did get a teaser with the recent Alaska
> quake...would have recorded it but that was the 12 hours that the system
> was down for some early modifications....hummf.
>
> Right now I'm oil damped, but hope to make the metal damper. I have seen
> that both copper and aluminum are used. Is either better than the other?
> I don't have ready access to copper plate (is it available at Home Depot
> or Lowes?) so I was going to use a pipe that I flattened. What kind of
> thickness is needed?
>
> I'm running WinSDR and I fiddled around with the gain on the board. Is
> there a baseline count that I should aim for...I think that someone put it
> at around 100 or 200 (boy, that 4th quarter list archive was looong).
> Also, does it matter if I display raw or filtered data? I'm using the
> default WinSDR settings for alarms and filters.
>
> Finally, now that I've got the bug, of course I want more instruments. I
> was thinking about the SG sensor, but the volksmeter has my interest
> piqued. I heard that it might only be ready-made, but maybe it wouldn't be
> too difficult to build one. The upright(s) of aluminum; shaft of aluminum
> (although the PDF looks like it was made of brass). The plates could be
> made of PCB board, etched if needed. It would just be the electronics
> that I would need to buy. One of the things that I find neat about that
> design is that it probably could be minimized to a size where it could fit
> in a 6 inch tube and be sunk several feet/meters in the ground (with
> remote motor leveling and such)
>
> Ok, enough of my ideas. My ignorance of seismology betrays me. Any
> thoughts or ideas would be welcome. Thanks!
>
> - Mike
>
>
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