The Midlands continues to shake as the seventh earthquake is confirmed. Here’s when, where the latest hit.

U.S. seismologists confirmed that the Midlands had its seventh quake in four days Thursday afternoon.

The earthquake with a magnitude of 2.4 happened around 2:15 p.m.according to the U.S. Geological Survey. Like the six other earthquakes, its epicenter near Elgin was about 20 miles from Columbia.

The first earthquake in the latest string occurred on December 27th. With strengths of 2.5 or less, most earthquakes have been minor. Thursday afternoon’s earthquake was the second of the day. The first happened around 7 p.m.

Tremors can not even be felt with a magnitude of 2.5 or less, even if they are detected by seismic activity detecting devices. But over the past four days, people have reported feeling their homes shaking and hearing loud booms caused by the earthquakes.

The first earthquake on December 27 reached a magnitude of 3.3, which is still relatively weak, according to seismologists. Anything less than 5.5 is unlikely to cause harm.

Seismologists say earthquakes can occur in clusters.

This map from the USGS shows a cluster of earthquakes that happened in the Midlands in late December.

This map from the USGS shows a cluster of earthquakes that happened in the Midlands in late December.

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