'Ghost' That Haunts South Carolina Rail Line May Be Caused By Tiny Earthquakes

sciencehabit shares a report from Science: Legend has it that if you walk along Old Light Road in Summerville, South Carolina, you might see an eerie glow hovering over an abandoned rail line in the nearby woods. Old-timers will tell you it's a spectral lantern held by the apparition of a woman searching for her decapitated husband's head. Susan Hough has proposed a scientific explanation that is far more plausible, however. A seismologist with the U.S. Geological Survey, she believes the so-called Summerville Light could represent a rare natural phenomenon: earthquake lights.

Sparks from steel rail tracks could ignite radon or other gases released from the ground by seismic shaking, Hough explains in an interview with Science. In Summerville, I think it's the railroad tracks that matter. I've crawled around tracks during my fieldwork in South Carolina. Historically, when [rail companies] replaced tracks, they didn't always haul the old track away. So, you've got heaps of steel out there. Sparks might be part of the story. And maybe the railroads are important for another reason. They may naturally follow fault lines that have carved corridors through the landscape. The findings have been published in the journal Seismological Research Letters. Hough also cites a paper published by Japanese scientist Yuji Enomoto that connects earthquake lights to the release of gases like radon or methane.

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