Quake Sets Clock Back?

Did you adjust your clocks after the 9.0 earthquake in Sumatra this week? All 3 microseconds worth? Scientists won't really know it that's necessary for weeks, but large quakes can disrupt the Earth's rotation. This happens when significant mass moves either outwards or inwards. In other words, if the planet gets slightly larger or smaller, the rate of rotation changes. Like an ice skater tucking her arms in.