[time-nuts] Change to Earths rotation rate due to Chinese earthquake
fortime at bellsouth.net
Fri May 16 02:12:21 EDT 2008
----- Original Message -----
From: "John E Burgar" <johneburgar at cox.net>
To: <time-nuts at febo.com>
Sent: Friday, May 16, 2008 12:26 AM
Subject: [time-nuts] Change to Earths rotation rate due to Chinese
> 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.
I believe the December quake you reference is the 8.4-magnitude 2004
It supposedly changed the earths length of day: -2.676 microseconds or the
day became shorter by 0.0000027 seconds. As I understand it, the length of
the day can be measured with an accuracy of about 20 microseconds.
What was affected was the so-called Chandler Wobble. Some believe it is the
cause of the earthquakes rather than the effect. This is an extremely
interesting subject. I haven't seen anything on the present quake but it
usually takes a while for anything to be published.
You might find more searching Chandler Wobble
More information about the time-nuts