Will Charleston Have Another Earthquake? What USGS Says

Yes. Charleston will have another earthquake, and it has small ones most years. The question is when the big one comes back. The USGS models a repeat of the 1886 Charleston earthquake, estimated at magnitude 6.9 to 7.3, roughly every 500 to 650 years, based on the dates of older quakes written into the soil.

That is an average, not a schedule. Here is what is known.

What happened in 1886?

At about 9:50 on the night of August 31, 1886, an earthquake struck with its epicenter northwest of Charleston, near Summerville. About 60 people died. Nearly all of Charleston’s 8,000 buildings had some damage and about 2,000 were seriously damaged; brick accounted for 81 percent of the losses. Shaking was felt in Boston, Chicago, New Orleans, Cuba and Bermuda. The iron plates and rods on old Charleston walls, called earthquake bolts, were added afterward to tie the masonry together.

It remains the most damaging earthquake recorded in the eastern United States. The ground that broke was not under the Battery. It was under Dorchester County.

Where is the Charleston seismic zone?

The state emergency management division says about 70 percent of South Carolina’s earthquakes occur in the Middleton Place–Summerville Seismic Zone, between the Ashley River plantations and the town of Summerville. The USGS does not model it as a single known fault. It draws an areal zone around the places where geologists have found paleoliquefaction, the sand blows prehistoric quakes leave in the ground, and places hypothetical faults throughout it.

How often does a big one happen?

The USGS hazard model assigns a magnitude 7.3 earthquake to the zone with a recurrence time of 650 years, based on paleoliquefaction dates. Daniel Frost, a seismology professor at the University of South Carolina, told Spectrum News in February 2026 that paleoseismology work by a predecessor found a cycle of roughly 500 years. Either way, 1886 was 140 years ago. Nothing in those numbers says the next one is due or not due. Frost also noted that the state’s faults are small, so the quakes people feel now are very unlikely to grow much larger.

Has Charleston had earthquakes recently?

Yes, and more than usual. SCEMD says South Carolina normally records 10 to 15 earthquakes a year, three to five of them felt. In 2024 there were 30. In 2025, more than 20. By February 11, 2026, there had been five, the strongest a magnitude 2.9 near Charleston that nearly a thousand people reported feeling. Frost said experts are not sure why.

The Summerville Light, the town’s lantern-carrying ghost, may belong on this list. In January 2025 USGS seismologist Susan Hough published a paper arguing that the sightings cluster near the 1886 epicenter and near three magnitude 3.5 to 4.4 quakes in 1959 and 1960, and that gas released by small quakes along the Summerville Fault could produce lights along the rails. The dispatches have their own position on this and it is not a seismological one. See The Tower With No Bell.

Are Charleston’s buildings ready?

New ones are built for it. The City of Charleston builds to the 2021 South Carolina building codes and lists its Seismic Design Category as D2, a high category requiring engineered seismic resistance in new construction. The old brick buildings that make downtown worth visiting predate all of that. The earthquake bolts were a repair, not a cure.

What should you do?

SCEMD’s guidance is the standard one. Indoors, drop, get under a sturdy table, and hold on until the shaking stops; with no table, cover your head and crouch in an inside corner away from windows. Outdoors, get into the open away from buildings, trees and lines. In a car, pull over clear of overpasses and stay inside. Afterward, expect aftershocks for days to months, check for gas and electrical damage, and on the coast watch for a tsunami. Before any of it, bolt down shelves and water heaters.

The quakes are upriver. So is most of what this site is about. The county history and the map start there.

Frequently asked questions

Q. When was the last big earthquake in Charleston?

A. August 31, 1886, magnitude 6.9 to 7.3, with about 60 deaths. No earthquake of comparable size has struck the eastern United States since.

Q. Is Charleston on a fault line?

A. Not one that reaches the surface. The USGS treats the Charleston seismic zone as an area of buried, poorly mapped faults northwest of the city, identified mostly by the 1886 damage pattern and prehistoric liquefaction features. The Summerville Fault runs beneath that town.

Q. How many earthquakes does South Carolina have a year?

A. Ten to fifteen on average, three to five of them felt, though 2024 had 30 and 2025 more than 20.

Will Charleston have another earthquake?