If super quake slows earth rotation slightly, how does GPS system compensate?

Per the story below. Will a slowdown of say, 3 microseconds, mess up the super precise GPS satellite programming calculations?

Quake rattled Earth orbit, changed map of Asia: US geophysicist

I am not an expert on GPS but I know that they have ground stations to ‘calibrate’ the satilites.

I know about the ground stations per a previous thread. What I’m wondering (and I should have been much clearer in the OP) f this is something they have to deal with, or the if the earths rotation period is a non-issue for GPS calculations.

A GPS receiver is fundamentally calcultaing its location with respect to the GPS satellites. It uses satellite ephemeris information to relate this to a position on (or near) the earth. So if the earth’s position with respect to the satellites changes, it seems correct to assume that the satellites’ ephemeris data must be updated to account for this.

According to a Chicago astronomer (registration required), the day is a bit shorter.

The GPS atomic clocks are regularly updated to keep them in step with the earths varying rotation rate. There are also some rather surprising reasons for that varying rate.

I’ll second treis, in that I know for a fact that things will be corrected. There are systems in place for events such as this.

Tripler
Despite the Iraqi war, I’d ask that you have some faith in the U.S. Government . . .

No. GPS will just indicate some places in the world have moved. As they have.

Frankly, there would be a lot more support for a 25 hour day than taking whatever we have now and shortening it. Needless to say, this doesn’t help.

For a look at the baffling complexity encompassed by DS’s sentence, check the website of the International Earth Rotation and Reference Systems Service (IERS), and the Earth Orientation Department of the U.S. Naval Observatory.
The navy site has a good summary of what’s meant by Earth Oriention here, and the 2003 annual report of the IERS contains a subreport (pdf) from the International GPS Service (IGS) which includes a map of the location of the 362 ground tracking stations used by the GPS service. There’s a station at the southern tip of Sumatra, and another near Madras India.