Hal Murray wrote:
jim...@earthlink.net said:
The Chilean earthquake changed the angular rotation rate (or, probably more
accurately, changed the direction of the axis of rotation as well)
of the earth a small amount, as do most large earthquakes.
Has anybody measured that?
I don't think you can measure it directly.. it's way smaller than lots
of other effects
Is there a good URL on this? (predictions if not data) All I've found so
far is a small NASA press release predicting 1.26 microseconds per day:
http://www.nasa.gov/topics/earth/features/earth-20100301.html
(and a zillion news sources repeating it)
http://www.jpl.nasa.gov/news/news.cfm?release=2010-071&rn=news.xml&rst=2504
I remember reading something fairly detailed..it might have been on a
newsgroup at work.I work at JPL, and Richard Gross is in a section with
a lot of people I work with at JPL, so it might have been discussed at
lunch. I'll see if I can find out
You could probably send him an email and ask..
richard.gr...@jpl.nasa.gov
heck, he might be lurking on this very list..
Day length is one of his things
trs-new.jpl.nasa.gov/dspace/bitstream/2014/18309/1/99-1782.pdf
trs-new.jpl.nasa.gov/dspace/bitstream/2014/18398/1/99-1877.pdf
trs-new.jpl.nasa.gov/dspace/bitstream/2014/12097/1/02-0952.pdf
1 microsecond/day is 1 part in 1E11.
---------
From a friend in radio astronomy (VLBI):
They had a lot of the right instruments in the right place.
Graph of position (3 meters!):
http://ivsopar.obspm.fr/earth/tigo
Description of the TIGO package:
http://cddis.gsfc.nasa.gov/lw12/docs/Riepl_Tigo.pdf
Letter from the director:
http://www.expres-eu.org/Chile_06032010.html
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
