how big earthquakes impact the whole planet

Submitted by Quest-News-Serv... on Wed, 11/18/2009 - 02:18.



ORIGINAL CAPTION: To depict the effects of a temblor more fully, illustrator Jason Lee researched how P waves (which travel in compression like a Slinky) and S waves (which travel like undulations in a rope) move through the geologic layers. “The challenge with an earthquake is depicting the motion and how it changes over time,” Lee says. “People think of waves as linear, but a quake releases energy in all directions, making it hard to visualize.”

Using simulations from a program called Seismic Waves, created by Alan Jones at Binghamton University, Lee traced the complex paths traveled by that energy, including how the waves change their course (or type) when they hit areas of different density. “I first visualized the various stages of an earthquake,” he says, “and then composited some of them into a single image showing its progression through and around Earth’s core.” (Exploring Under the Earth, 1960 illustration: John Polgreen)

 

 

http://standeyo.com/NEWS/09_Pics_of_Day/091117.pic.of.day.html

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