PSN-L Email List Message

Subject: Re: Re: earth tide tables
From: "Cynthia" cynthia@.........
Date: Mon, 4 Jul 2005 21:27:22 -0700


Hi Tom,

Thanks kindly for your information.  I was desperately searching the web
that day trying to find what I needed.  I finally found it on a Navy
military site.  (the tables that I needed)  As a result, I correctly forcast
the recent seismic activity.  I had forcast them four months prior as did I
forcast the December quake in the Indian Ocean.  I have the time right
(within 48 hours) 80 percent of the time, but I haven't been so good with
the exact location.  Tides are only about 1/40th of the equation, though,
helping me with the location aspect of my formulas.  I just didn't have the
scientific background and don't live near libraries or adequate
universities.  Once I saw that I was within days, I had to get info quickly.
Thanks for your big help.  Feel free to keep me posted on any interesting
upcoming events in your field.  I'd truly love to hear about them, as our
rise of activity (if I'm correct) is on the upswing over the next two years.
It's interesting how sciences are really linked together when you look at
the big picture.  

Cynthia in Oregon




----- Original Message ----- 
From: "Tom Schmitt" 
To: 
Sent: Sunday, June 26, 2005 10:34 AM
Subject: RE: earth tide tables


> I think that if you go to a basic geophysics book the sections on
> gravimetery will have some formulas for the attraction of the moon and
> sun as a function of latitude, year,  time of day etc.  One has to
> correct for those when doing a gravity survey.   The second order
> effects are harder to get and very, very small.
>
> Absolute gravity measurements used to be made with pendulums.  I do not
> know how they do them now.  I think they had to stay on station a long
> time,  like longer than the variation due to sun moon interactions,
> however a good geophysics or geodesy book will have that in it also.
>
> Tom Schmitt
>
> -----Original Message-----
> From: psn-l-request@.............. [mailto:psn-l-request@...............
> On Behalf Of BOB BARNS
> Sent: Friday, June 24, 2005 8:06 PM
> To: psn mail
> Subject: earth tide tables
>
> Hi gang,
>
>    A friend has several high precision pendulum clocks (and has built 2
> others).
>    He asked me to inquire of this list about where to get tables of
> earth tide data so that he can compare changes in the local value of g
> to daily variations of period which he sees in his clocks.
>
> Bob
>
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