QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

9 km E of Brian Head, Utah

· 7.2 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Iron County 55 kmWashington County 81 kmBeaver County 86 kmPiute County 90 kmKane County 94 kmGarfield County 115 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
7.2 km below the surface
Felt
no reports yet
Nearest
Iron County, 55 km WNW
Nearest mapped fault
Cedar City-Parowan monocline (and faults), 18 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3326 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 37.6897, -112.7445. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Iron County, UT 55 km (34 mi) ESE of here earthquakes near Iron County
Washington County, UT 81 km (50 mi) NE of here earthquakes near Washington County
Beaver County, UT 86 km (53 mi) SSE of here earthquakes near Beaver County
Piute County, UT 90 km (56 mi) SW of here earthquakes near Piute County
Kane County, UT 94 km (58 mi) WNW of here earthquakes near Kane County
Garfield County, UT 115 km (71 mi) W of here earthquakes near Garfield County

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

Aftershocks so far

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

  1. 2.5 19 km N of Paragonah, Utah
  2. 2.0 19 km N of Paragonah, Utah
  3. 1.9 1 km WSW of Enoch, Utah
  4. 1.8 19 km N of Paragonah, Utah
  5. 1.7 1 km SW of Enoch, Utah
  6. 1.8 2 km WSW of Enoch, Utah
  7. 1.6 2 km SSE of Enoch, Utah
  8. 1.6 20 km SE of Minersville, Utah
  9. 1.8 18 km SSE of Beaver, Utah
  10. 1.6 12 km SSE of Kanarraville, Utah
  11. 1.6 2 km SSW of Enoch, Utah
  12. 1.8 1 km WSW of Enoch, Utah
  13. 2.5 10 km SE of Alton, Utah
  14. 1.7 18 km SSE of Minersville, Utah
  15. 1.5 20 km WNW of Cedar City, 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

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