Residents across parts of the South Carolina Piedmont were jolted overnight Friday after a swarm of small earthquakes rattled the region, according to the U.S. Geological Survey.

Most of the shaking was centered in Greenwood County, which sits between Columbia and Greenville, just east of the Savannah River.

The USGS reported at least seven measurable earthquakes occurred after midnight on Saturday, with magnitudes ranging from 1.8 to 3.0.

The National Weather Service office in the Greenville-Spartanburg area asked residents on social media whether they felt any of the tremors.

Several people from Greenwood County responded that the jolts were strong enough to wake them up and even knock over small objects, such as photos.

Due to the activity’s shallow nature, loud booms were also r

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