Just 30 minutes before the earthquake that killed tens of thousands in the Chinese province of Sichuan in May, local video footage captured on a cell phone revealed rainbow lights in the clouds. The theory behind earthquake lights is that seismic activity sends ultrasonic waves through mineral deposits in the earth's crust. These waves react with water molecules in the sky to produce a rainbow effect in clouds. The scientific evidence for this is dubious at best. That said, earthquake lights are just one of a number of anecdotal methods for predicting quakes.
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"Lights, Camera, Earthquake?"Please download to view full document