> 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 http://www.sciam.com/article.cfm?id=bad-weather-makes-day-long NASA Details Earthquake Effects on the Earth http://www.jpl.nasa.gov/news/news.cfm?release=2005-009 Magnitude 9.0 Sumatra-Andaman Islands Earthquake FAQ http://earthquake.usgs.gov/eqcenter/eqinthenews/2004/usslav/faq.php Did the 26 December 2004 Sumatra, Indonesia, Earthquake Disrupt the Earth's Rotation as the Mass Media Have Said http://www.agu.org/pubs/crossref/2005/2005EO010003.shtml http://www.agu.org/journals/eo/eo0501/2005EO010003.pdf The rotational and gravitational signature of the December 26, 2004 Sumatran earthquake http://www.springerlink.com/content/b15n1plt360uvp42/ http://www.springerlink.com/content/b15n1plt360uvp42/fulltext.pdf /tvb http://www.LeapSecond.com _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
