[time-nuts] Q/noise of Earth as an oscillator

"Björn Gabrielsson" bg at lysator.liu.se
Fri Jul 29 16:48:28 EDT 2016


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 <hmurray at megapathdsl.net> wrote:
>
>>
>> tvb at LeapSecond.com 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.
>>
>>
>>
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