[time-nuts] Change to Earths rotation rate due to Chinese earthquake

Tom Van Baak tvb at LeapSecond.com
Fri May 16 04:08:22 EDT 2008

> Have any of your members seen any data regarding a change to the earths
> rotation rate due to the recent Chinese earthquake? I seem to recall that
> the Banda Aceh earthquake in December a few years ago had a measurable
> impact on the rotation rate.  Many regards to the many extremely
> knowledgeable members of this group, John B.

Right, the Banda Aceh event was 2.68 microseconds -- but
I think that was a calculated value, not a measured value.
The length of day varies quite a bit day to day (by hundreds
of microseconds or more), so a few microsecond effect is
lost in the noise.

Here are some links, in increasing technical order:

Bad Weather Makes for a Long Day

NASA Details Earthquake Effects on the Earth

Magnitude 9.0 Sumatra-Andaman Islands Earthquake FAQ

Did the 26 December 2004 Sumatra, Indonesia, Earthquake
Disrupt the Earth's Rotation as the Mass Media Have Said

The rotational and gravitational signature of the
December 26, 2004 Sumatran earthquake


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