[Aki]

The earthquake in Asia has accelerated the Earth's rotation slightly. It has caused the Earth to spin 3 microseconds faster and to tilt about an inch on its axis. Althought this is not very significant and will unlikely cause any long-term effect.

Here is the article:
http://www.reuters.com/newsArticle.jhtml;jsessionid=IESG1YFI1NHI2CRBAELCF FA?type=scienceNews&storyID=7195443

When those tiny variations accumulate, planetary scientists must add a "leap second" to the end of a year, something that has not been done in many years, Gross said.