The change is negligible, but permanent: Each day should be 1.26 microseconds shorter, according to preliminary calculations. A microsecond is one-millionth of a second.

A large quake shifts massive amounts of rock and alters the distribution of mass on the planet.

When that distribution changes, it changes the rate at which the planet rotates. And the rotation rate determines the length of a day.

This brought to mind the passage in Mark:

Unless the Lord had shortened those days, no life would have been saved; but for the sake of the elect, whom He chose, He shortened the days.  (Mark 13:20)

I do believe there is a bigger picture in terms of the "shortening of those days" but it is interesting to see a possible (minute) connection in this quake.