Mashable 01月25日
A ghost is said to roam this railroad. A scientist has another idea.
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美国各地铁路沿线常有幽灵提灯笼的目击报告,地质学家Susan Hough认为这可能并非超自然现象,而是地震光。她研究了1886年查尔斯顿地震附近的Summerville铁路幽灵事件,发现该地区曾发生过多次地震。Hough推测,浅层断裂带释放的气体可能被困在水蒸气中,并在接触氧气后被火车铁轨产生的静电点燃,形成类似灯笼的光芒。她建议通过检测氡气和寻找浅层断裂带来验证这一理论。虽然美国东部地震活动不如西海岸频繁,但了解浅层断裂带的风险至关重要,因为潜在的地震可能对人口稠密地区造成严重影响。

👻美国铁路沿线常有幽灵提灯笼的目击报告,地质学家认为这可能与地震光现象有关,而非超自然事件。

🔦Summerville铁路幽灵事件引起了Hough的关注,该地区曾发生过多次地震,包括1886年的7.0级地震,这促使她思考幽灵灯笼是否是地震光。

💡地震光可能源于浅层断裂带释放的气体,如甲烷或氡气,这些气体被困在水蒸气中,在接触氧气后被火车铁轨产生的静电点燃。

🧪Hough建议通过检测氡气和寻找浅层断裂带来验证这一理论,并强调了解美国东部浅层断裂带的风险,以应对潜在的地震威胁。

A decapitated train conductor is said to prowl a section of railroad in Maco Station, North Carolina, illuminating the tracks with a lantern.

But this ghost is far from the only reported rail sighting in the U.S. "There's a recurring theme. There are ghosts reported along railroad tracks holding lanterns," U.S. Geological Survey seismologist Susan Hough told Mashable.

While investigating the 1886 quake in Charleston, South Carolina — a potent 7.0 temblor that collapsed buildings and killed some 60 people — the legendary haunting of the nearby abandoned Summerville rail captured Hough's attention. As the viral shaking in New York City in 2024 illustrated, earthquakes stoked by shifting faults do rattle the Eastern U.S. from time to time. Perhaps, thought Hough, the Summerville ghost's lantern is actually a radiant earthquake phenomenon reported globally called "earthquake lights," commonly described as balls of light or steady glows.

"Maybe these ghosts are showing us where you have shallow, active faults in these [eastern] areas," said Hough, who recently published a research article on the phenomenon in the journal Seismological Research Letters.

While visiting the Charleston area, Hough dug up old book records from the 1950s and 1960s, which documented residents' attempts to spy light from the Summerville ghost (the lantern was supposedly carried by an apparition waiting for her husband to return). One such account reported that, during a Summerville ghost outing, their car shook violently.

"To a seismologist, that screams a shallow earthquake," Hough said.

"There are ghosts reported along railroad tracks holding lanterns."

Hough suggests that many of these sightings can be explained by quaking activity or earthquake faults. Summerville, after all, is thought to be the epicenter of the 1886 quake, and smaller 3.5 to 4.4 temblors hit there in 1959 and 1960. Even milder quakes, too small to be felt, but able to potentially produce earthquake lights, almost certainly affect the region, too.

A locomotive derailed by the Aug. 31, 1886, earthquake in South Carolina. Credit: CORBIS / Getty Images
Damage on East Bay Street in Charleston from the 1886 earthquake. Credit: Bettmann / Contributor

If the supernatural isn't responsible for the radiance, how might quakes naturally create such brilliant lights?

Hough thinks that most quake experts accept that earthquake lights do occur, though there's still some skepticism. It's unclear, however, what causes them — but there are compelling seismic ideas. In the case of the "railroad ghosts," the process may begin with gases, like methane or radon, escaping to the surface through underground fractures in a shallow fault zone. Once on the surface, the gases can become trapped in water vapor and pool, igniting when they're exposed to oxygen. Then, the trains come into play. Trains create static electricity on steel tracks; even abandoned lines or heaps of steel rail can create the static spark, ultimately producing the eerie light.

Of course, not every railroad ghost is stoked by fault phenomena, Hough cautions. Sometimes, they're headlight reflections from nearby highways. But many could be caused by faults. And Hough says this could be tested, for example, by purchasing radon kits and placing them where the lights are, or have been, reportedly seen. Scientists could also look for shallow faults in these areas.

An old illustration of two people ghost-hunting on railroad tracks with a lantern. Credit: PennyLens / Getty Images

The Eastern U.S. certainly doesn't have the robust quaking activity seen on the West Coast — as there are no well-defined faults or major earthquake zones like California's infamous San Andreas Fault — but it'd behoove us to understand where these shallow faults are, and better grasp their risk.

In 2011, a magnitude 5.8 earthquake hit near Mineral, Virginia, with significant shaking reaching some 80 miles away, to Washington, D.C. The temblor damaged the Washington National Cathedral and Washington Monument. Fortunately, no one was killed.

But what if such a relatively rare quake hit much nearer to the nation's capital?

"If it was closer, it could have had a serious impact," Hough said.

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相关标签

地震光 铁路幽灵 断裂带 静电 地质学
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