QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

8 km N of Richburg, South Carolina

· 0.9 km deep · released about 91 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Chester County 18 kmYork County 25 kmLancaster County 31 kmFairfield County 46 kmUnion County 49 kmMecklenburg County 53 kmUnion County 56 kmGaston County 57 kmCherokee County 61 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 2.3 (md)
Depth
0.9 km below the surface
Felt
23 reports · strongest reported intensity IV
Nearest
Chester County, 18 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 521 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 23 people have reported feeling it to USGS.

How big was it?

This earthquake released about 91 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 170,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 120,000× the energy of this one
  3. Around the size people start to feel M 3.0 10× the energy of this one
  4. This earthquake M 2.3 about 91 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

Where

Epicentre 34.7958, -81.0143. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Chester County, SC 18 km (11 mi) NE of here earthquakes near Chester County
York County, SC 25 km (15 mi) SE of here earthquakes near York County
Lancaster County, SC 31 km (19 mi) WNW of here earthquakes near Lancaster County
Fairfield County, SC 46 km (28 mi) NNE of here earthquakes near Fairfield County
Union County, NC 49 km (31 mi) WSW of here earthquakes near Union County
Mecklenburg County, NC 53 km (33 mi) SSW of here earthquakes near Mecklenburg County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

13 earthquakes have been recorded within 50 km since this one.

  1. 1.9 19 km NW of Winnsboro, South Carolina
  2. 2.4 18 km NW of Winnsboro, South Carolina
  3. 2.3 17 km NW of Winnsboro, South Carolina
  4. 1.7 19 km S of Gayle Mill, South Carolina
  5. 2.3 18 km NW of Winnsboro, South Carolina
  6. 1.8 9 km SSW of Kershaw, South Carolina
  7. 2.2 7 km SSW of Jaars, North Carolina
  8. 1.7 5 km W of Jaars, North Carolina
  9. 2.2 3 km NNW of Lesslie, South Carolina
  10. 2.2 9 km SE of Belmont, North Carolina
  11. 2.1 1 km NNW of Pineville, North Carolina
  12. 1.8 13 km SSW of Heath Springs, South Carolina
  13. 2.0 5 km NNE of Lesslie, South Carolina

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.