On 06/12/2010 02:33 AM, 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?
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)
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.
Indeed.
Graph of position (3 meters!):
http://ivsopar.obspm.fr/earth/tigo
3 meters in one direction and 60 in another.
Description of the TIGO package:
http://cddis.gsfc.nasa.gov/lw12/docs/Riepl_Tigo.pdf
Nice system. How do I get one on the back yard?
6 m VLBI antenna, 50 cm SLR scope, two H-masers, 2 Caesium beams, 4 Z-12
with choke ring antennas, UPSs, diesels, staff meeting room, 2
workshops. Accelerometers, metrological station...
Letter from the director:
http://www.expres-eu.org/Chile_06032010.html
No progress report from that site what I could see.
Cheers,
Magnus
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