[CliffordK (OP)]

With the discussion of Leap Seconds...  I started some browsing.

the solar day becomes 1.7 ms longer every century due mainly to tidal friction (2.3 ms/cy, reduced by 0.6 ms/cy due to glacial rebound).

Looking at the chart, however, it appears as if the days have become about 2 ms SHORTER since 1970.  And, in fact, about 2 leap seconds were added in 1972, and 1 leap second a year for the next 7 years.

However, there have only been 3 leap seconds added since 1999 (including the one scheduled for June this year).

So...
Over the last 30 years, the days seem to be getting shorter, and the Earth seems to be spinning faster. 

Why?

[Chemistry4me]

Could it be all these earthquakes?