The main issue has been deemed to be safety- or lack of it, due to the ring
lasers location in an underground cavern that cannot continue to be used
because of a high risk of additional ground/rock failure. For the present
there has been no further ring laser work at canterbury university since the
2010/2011 quakes and cave access is not permitted.
DaveB,
Christchurch, NZ
----- Original Message -----
From: ""Björn Gabrielsson"" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Saturday, July 30, 2016 8:48 AM
Subject: Re: [time-nuts] Q/noise of Earth as an oscillator
I'am not sure how the big ring lasers have progressed over the past
years. It seems the big New Zeeland earthquake messed up the nice ring
lasers over there.
http://www.fs.wettzell.de/LKREISEL/G/LaserGyros.html
http://www.phys.canterbury.ac.nz/ringlaser/about_us.shtml
--
Björn
I believe a phase noise plot deep into the uHz or lower would apply to
the
rotation rate of the earth.
On Saturday, 23 July 2016, Hal Murray <[email protected]> wrote:
[email protected] said:
> Earth is a very noisy, wandering, drifting,
incredibly-expensive-to-measure,
> low-precision (though high-Q) clock.
What is the Q of the Earth? It might be on one of your web pages, but I
don't remember seeing it. Google found a few mentions, but I didn't
find a
number.
I did find an interesting list of damping mechanisms in a geology book.
Geology-nuts are as nutty as time-nuts. Many were discussing damping of
seismic waves rather than rotation.
I've seen mention that the rotation rate of the Earth changed by a few
microseconds per day as a result of the 2011 earthquake in Japan. Does
that
show up in any data? Your recent graph doesn't go back that far and
it's
got
a full scale of 2000 microseconds so a few is going to be hard to see.
--
These are my opinions. I hate spam.
_______________________________________________
time-nuts mailing list -- [email protected] <javascript:;>
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
