The Tornado That Shook the Earth

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BLOOMINGTON, Ind. — An Indiana University geophysical experiment detected unusual seismic signals associated with tornadoes that struck regions across the Midwest last week — information that may have value for meteorologists studying the atmospheric activity that precedes tornado disasters.

“The seismograms show a strong, low-frequency pulse beginning around 4:45 a.m. on Feb. 29. Our preliminary interpretation, based on other seismic records of tornadoes, suggests that we were recording not the tornado itself, but a large atmospheric pressure transient related to the large thunderstorms that spawned the tornadoes.”

Hat Tip: Phineas.

Posted by: Howie at 08:41 AM

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