On 7/4/15 12:18 PM, Brian Inglis wrote:
(the Japan earthquake in 2011 sped the earth up by 1.8
microseconds/day. The Sumatra quake on 26 Dec 2004 had a bigger
effect: 6.8 microseconds)
By my calculations, that should mean the earth rotated 3mm farther/day
at the equator after Sumatra.
Anyone know if, or how much, these perturbations affect the orbit of the
earth or other planets, or where to find out?
The folks at JPL who do these calculations could probably tell you..
http://scienceandtechnology.jpl.nasa.gov/people/r_gross/ is probably
your man.
http://www.iers.org/IERS/EN/Organization/ITRSCombinationCentres/JPL/jpl.html
Off hand, the center of mass of the earth shifted slightly (in addition
to the rotation rate change, there was a axis of rotation change), so
there would be a gravitational effect on other heavenly bodies.
Whether it is measurable is another thing. That's more of a celestial
mechanics thing. A different group at JPL who do that, but if you email
Richard Gross, he might tell you who does that.
Jim
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