Tectonic Plate Motion Reversal 

Not by Fire but by Ice

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14 August 07

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Tectonic Plate Motion Reversal 
Near Acapulco Puzzles Scientists
.

6 Aug 07 - Instead of creeping toward Mexico City at about one inch per year - the expected speed from plate tectonic theory - the region near Acapulco moved in the opposite direction for six months in the last half of 2006 and sped up by four times, said University of Colorado at Boulder aerospace engineering Professor Kristine Larson.

"The million-dollar question is whether the event makes a major earthquake in the region less likely or more likely," said Larson.

A paper on the subject by Larson, the University of Tokyo's Shin'ichi Miyazaki and UNAM's Kostoglodov and Josť Antonio Santiago was published Aug. 1 in Geophysical Research Letters.

Scientists use GPS satellite receivers to record laser pulses from spacecraft to measure tiny movements in Earth's crust.

"Before GPS we thought the ground moved at a constant speed between earthquakes," Larson said. "The recognition of these transient events where the plate reverses direction is arguably the most important geophysical discovery that has stemmed from the introduction of GPS measurements."

http://www.sciencedaily.com/releases/2007/08/070802130847.htm
Thanks to Jimmy Walter for this link





               

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