COLUMBIA, S.C. (AP/WCBD) — Another earthquake has struck near South Carolina’s capital city.

Wednesday’s 2.6-magnitude tremor near Elgin was the ninth in a series of rumblings that have caused geologists to wonder how long the convulsions might last. It was followed by another quake, a 1.5 magnitude, around 8:18 a.m.

The area has become the epicenter of a spate of recent seismic activity, starting with a 3.3-magnitude earthquake on Dec. 27.

Since then, nearly a dozen earthquakes have been recorded nearby, ranging from 1.7 to Wednesday’s 2.6 quake.

No injuries or damage have been reported.

Geologist Steven Jaume at the College of Charleston says he’d typically call the smaller quakes aftershocks of the first. But Jaume says the fact they’ve continued for 10 days is puzzling.

Officials with the South Carolina Emergency Management Division said the small earthquakes are not necessarily indicators of a larger earthquake to come. They said small quakes are common in South Carolina, which has faultlines that run throughout the state.