QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

9 km S of Saint George, Utah

· 11 km deep · released about 47 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Washington County 29 kmIron County 102 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 2.1 (ml)
Depth
11 km below the surface
Felt
9 reports · strongest reported intensity III
Nearest
Washington County, 29 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2706 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 9 people have reported feeling it to USGS.

How big was it?

This earthquake released about 47 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 320,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 20× the energy of this one
  4. This earthquake M 2.1 about 47 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 37.0177, -113.5957. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Washington County, UT 29 km (18 mi) SSW of here earthquakes near Washington County
Iron County, UT 102 km (64 mi) SSW of here earthquakes near Iron County
Lincoln County, NV 131 km (82 mi) ESE of here earthquakes near Lincoln County

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

Aftershocks so far

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

  1. 1.6 16 km SSE of Saint George, Utah
  2. 1.6 12 km ESE of Pine Valley, Utah
  3. 1.9 22 km SSW of Saint George, Utah
  4. 2.0 14 km SSW of Saint George, Utah
  5. 1.5 13 km SSW of Saint George, Utah
  6. 1.7 6 km N of Saint George, Utah
  7. 2.7 31 km SSE of Saint George, Utah
  8. 1.5 15 km S of Saint George, Utah
  9. 1.5 12 km E of Pine Valley, Utah
  10. 1.7 8 km E of Pine Valley, Utah
  11. 1.5 16 km SSE of Saint George, Utah
  12. 1.9 8 km S of Saint George, Utah
  13. 2.1 17 km NNW of Beaver Dam, Arizona
  14. 2.2 8 km SSW of Leeds, Utah
  15. 2.5 16 km SSE of Saint George, Utah

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.