Change in length of day: -2.676 microseconds
Polar motion excitation X : -0.670 milliarcseconds
Polar motion excitation Y: 0.475 milliarcseconds

"Since the length of the day can be measured with an accuracy of about 20 microseconds, it is predicted that the change in the length-of-day caused by the earthquake is much too small to be observed. And, since the location of the earthquake was near the equator, the change in polar motion excitation is also rather small, being about 0.82 milliarcsecond in amplitude. Such a small change in polar motion excitation will also be difficult to detect. " Citation source: http://earthquake.usgs.gov/eqinthenews/

2004/usslav/neic_slav_faq.html