Earthquake shakes through part of Midlands away from where most tremors have hit

Over the past 24 hours there were multiple warnings for threats of severe weather above the surface of the Columbia area, but there was no expectation that another earthquake would hit the Midlands.

But that’s what happened, as a 1.4 magnitude earthquake was recorded Monday morning, according to the U.S. Geographical Survey.

The earthquake was confirmed at 6:33 a.m. near Winnsboro, which is in Fairfield County, the South Carolina Emergency Management Division said. That’s about 20 miles west of where a flurry of seismic activity has been recorded over the past two years.

Monday’s earthquake happened at about 2.8 miles beneath the surface, according to the USGS.

This was the first seismic activity in South Carolina since a 1.3 magnitude quake hit the Elgin area on Feb. 28, according to the state Department of Natural Resources.

While it has been uncommon for earthquakes to hit in other areas of the Palmetto State, there have been 48 confirmed earthquakes in Kershaw County since the end of June 2022, according to the South Carolina DNR.

That’s also where South Carolina’s most powerful recent earthquakes were recorded on June 29. On that day, two earthquakes — one a 3.5 magnitude and the other 3.6 — were included in a flurry of tremors and aftershocks. Those were the two largest quakes to hit South Carolina in nearly a decade. A 4.1-magnitude quake struck McCormick County in 2014.

Anyone who felt tremors and shaking or heard rumbling from Monday’s earthquake can report it to the USGS.

The most recent earthquake means at least 83 have been detected in the Palmetto State since the start of 2022, according to South Carolina DNR. All but eight of the quakes have been in the Midlands.

In all, 82 earthquakes have hit the Columbia area since a 3.3-magnitude quake was recorded Dec. 27, 2021, according to the DNR.

The S.C. Emergency Management Division said Monday’s earthquake was classified as a micro quake, according to the Modified Mercalli Intensity Scale.

No major damage or injuries have been reported from any of the recent quakes.

Earthquakes that register 2.5 magnitude or less often go unnoticed and are usually recorded only by a seismograph, according to Michigan Technological University. Any quake less than 5.5 magnitude is not likely to cause significant damage, the school said.

It is typical for South Carolina to have between six and 10 earthquakes a year, the S.C. Geological Survey previously reported. There have been 108 earthquakes in South Carolina since Jan. 18, 2021, according to DNR.

During a 2022 town hall to address the earthquakes, state geologist Scott Howard said as many as 200 smaller tremors might have gone unnoticed and unrecorded.

Why the increase in earthquakes?

An explanation for the outburst has eluded scientists.

Some experts have theorized there’s a link between the Wateree River and the earthquakes northeast of Columbia. They said the combination of a single moderate earthquake last December and high water levels in the Wateree River during parts of this year have contributed to the earthquakes. But no one has settled on the single cause for the Midlands’ shaking.

Elgin, located about 20 miles northeast of Columbia and situated on a fault line, has been experiencing an unusual earthquake “swarm” for the past several months, leaving some residents feeling uneasy. The series of quakes might be the longest period of earthquake activity in the state’s history, officials said. But officials have said they don’t believe the spate of minor earthquakes is an indicator that a bigger quake could be on the way.

“Though the frequency of these minor earthquakes may alarm some, we do not expect a significantly damaging earthquake in South Carolina at this time, even though we know our state had them decades ago,” South Carolina EMD Director Kim Stenson previously said in a news release. “Now is the time to review your insurance policies for earthquake coverage, secure any items in your home that may become hazards during a tremor, and remember to Drop, Cover, and Hold on until the shaking passes. These are the precautions South Carolinians can take to properly prepare for earthquakes.”

The strongest earthquake ever recorded in South Carolina — and on the east coast of the United States — was a devastating 7.3 in Charleston in 1886.

That quake killed 60 people and was felt over 2.5 million square miles, from Cuba to New York and from Bermuda to the Mississippi River, according to the state EMD.

Reported earthquakes in SC in 2021-23