QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

17 km SSE of Saint George, Utah

· 6.9 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Washington County 33 kmIron County 106 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 1.8 (ml)
Depth
6.9 km below the surface
Felt
no reports yet
Nearest
Washington County, 33 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2805 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 870,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 620,000× the energy of this one
  3. Around the size people start to feel M 3.0 55× the energy of this one
  4. This earthquake M 1.8 about 17 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 36.9655, -113.4982. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Washington County, UT 33 km (21 mi) S of here earthquakes near Washington County
Iron County, UT 106 km (66 mi) S of here earthquakes near Iron County

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

Aftershocks so far

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

  1. 1.6 8 km SSE of Washington, Utah
  2. 1.6 16 km SSE of Saint George, Utah
  3. 1.6 12 km ESE of Pine Valley, Utah
  4. 1.9 22 km SSW of Saint George, Utah
  5. 2.7 22 km SSW of Centennial Park, Arizona
  6. 2.0 14 km SSW of Saint George, Utah
  7. 1.5 13 km SSW of Saint George, Utah
  8. 1.7 6 km N of Saint George, Utah
  9. 3.4 24 km S of Centennial Park, Arizona
  10. 2.7 31 km SSE of Saint George, Utah
  11. 1.5 15 km S of Saint George, Utah
  12. 1.5 12 km E of Pine Valley, Utah
  13. 1.7 8 km E of Pine Valley, Utah
  14. 1.5 16 km SSE of Saint George, Utah
  15. 2.1 3 km SW of Centennial Park, Arizona

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.