SUMMERVILLE — In December 1974, a News and Courier reader wrote to the newspaper's Action Line column with a question.
"Did anyone ever decide what caused the ghost lights at Summerville?"
Answer: "Not that Action Line can find out."
Action Line, which answered a range of reader questions covering everything from spectral sights to how to read an electric meter, is long gone, replaced by Google and other search engines. But the modern-day Post and Courier might finally have an answer to that reader's question — 50 years and one month later. Better late than never.
A new research letter published in the journal Seismological Research Letters proposes that the Summerville Light isn't some ghost from beyond the grave, but a result of the seismic forces at play under the Dorchester County town.
The legend of the Summerville Light dates back at least to the 1950s. Specifics vary, but the most popular telling involves a woman who awaited her husband's return from work each evening along the railroad tracks on what is now Sheep Island Road. They'd walk home together through the dark South Carolina nights.
But one day, the man was beheaded in a train derailment. Now the woman exists in an eternal limbo, awaiting someone who will never arrive. The spooky lights along the track are her lantern, which once guided the couple back home each evening.
Susan Hough, the article's author and a scientist in the U.S. Geological Survey's Earthquake Hazards Program, said there's a down-to-earth explanation for the phenomenon. (Or more accurately, a below-the-earth explanation.)
Running under Summerville there is a fault line, fittingly named the Summerville Fault. After researching the fault for other studies, she noticed a trend. The light sightings tended to coincide with periods of seismic activity in the area. She theorizes that those events might have released gases from the fault line, which then interacted with the static charges from metal along the rail track, creating a light on the horizon.
The quakes, which were too small to be noticed by humans, might explain a significant amount of ghostly activity observed in Summerville at the time.
"Seismology can't really weigh in on whether ghosts are real; that's a whole other kettle of fish," Hough said. "But a lot of the accounts from Summerville just scream earthquake phenomenon, starting with the lights. Then there's other accounts of noises being heard upstairs, doors swinging, people feeling unsettled. They're almost textbook descriptions of shaking that's at the edge of human perceptibility."
The Summerville Light also fits a trope of the ghost that haunts a railroad track, variations of which can be seen in folklore across the world.
"When you start looking around, it turns out there's any number of ghosts wandering around railroad tracks with lanterns looking for severed heads," she said. "There's kind of an epidemic of them."
The trope has a second local example: the Jacksonboro Light. Found in a tiny, unincorporated Colleton County community, that specter shares a lot of similarities with the Summerville Light.
Those lights have also been seen near a railroad, and in an area close to a fault line. Even the stories are similar — although in Jacksonboro it's a preacher who gets hit by a train after using his lantern to search for his lost daughter.
"Why are the ghosts carrying lanterns along railroad tracks?" Hough continued. "It sort of suggests that the railroad tracks are an important ingredient to get the light."
The Summerville Light does have at least one possible connection to a real-world horrific disaster — the great Charleston Earthquake of 1886, which likely was the fault's fault.
Hough, an expert on the 1886 earthquake, noted in a study she co-authored in 2023 that there is no broadly agreed-upon fault line that caused that quake. But her research suggest the Summerville Fault was probably the offender.
The quake is considered one of the worst natural disasters in Charleston's history. Exact death counts vary, but the event claimed the lives of at least 60 people. Around an estimated Magnitude 7, its shockwaves were registered as far away as Wisconsin, according to the USGS.
Cracks and damage caused by the earthquake still can be found in historic structures across the city. Covered in 140 years of plaster and paint, those scars are yet another ghost that haunts the region.
Follow Jonah Chester on Twitter @chester_jonah.