Experts puzzled by continuing earthquakes in South Carolina | News

COLOMBIA – Yet more earthquakes have struck near the South Carolina capital, the ninth and tenth in a series of tremors that have prompted geologists to wonder how long the spasms might last, or whether they foreshadow more dangerous seismic activity in the future.

Early Wednesday, a 2.6-magnitude earthquake struck near Elgin, about 25 miles northeast of Colombia, according to the US Geological Survey. Officials said it was measured at a depth of 0.5 km. About seven hours later, another earthquake with a magnitude of 1.5 hit the area, officials said.

That area, with a population of less than 2,000 people near the border of Richland and Kershaw counties, has become the epicenter of a recent wave of seismic activity, beginning with a 3.3-magnitude earthquake on Dec. 27. in its tires, like a heavy piece of construction equipment or a concrete truck rolling down the road.

Since then, a total of nine more earthquakes have been recorded nearby, ranging from 1.5 to 2.6 on Wednesday morning. No injuries or damages were reported.

According to the South Carolina Department of Emergency Management, the state averages 20 earthquakes each year. Clusters occur more often, such as six small earthquakes in more than a week last year near Jenkinsville, about 38 miles west of the most recent group of earthquakes.

Earthquakes are nothing new to South Carolina, although most tend to occur near the coast. According to emergency management officials, about 70% of South Carolina earthquakes are located in the Middleton Place-Summerville seismic zone, about 12.4 miles northwest of Charleston.

In 1886, that historic port city was home to the largest recorded earthquake in the history of the southeastern United States, according to seismologists. The earthquake, believed to have had a magnitude of at least 7, left dozens dead and destroyed hundreds of buildings.

This event was preceded by a series of small tremors over several days, although it was not known that the previous tremors had necessarily led to something more catastrophic until after the Great Quake.

Frustratingly, there’s no way to know if smaller earthquakes portend something more serious, according to Stephen Gaum, a professor of geology at the College of Charleston who described the tremors before the 1886 Charleston disaster as “rare.”

“You can’t see that coming,” Jaume told The Associated Press on Wednesday. “There isn’t anything obvious that moves or changes that you can put your finger on so that you can say, ‘This leads to this.'”

Typically, Jaume said the recent earthquakes near Elgin — which lies along a large fault system stretching from Georgia through the Carolinas to Virginia — would be described as aftershocks from the December 27 event, since subsequent earthquakes were all smaller than the first.

But Jaume said the fact that events continue to unfold more than a week after the first event has caused panic among experts who study these events.

“They’re not dying the way we expect,” Gum said. “What does that mean? I don’t know.”

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