QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

7 km SW of Alton, Utah

· 3.8 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kane County 66 kmWashington County 85 kmIron County 89 kmGarfield County 108 kmPiute County 111 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 (md)
Depth
3.8 km below the surface
Felt
no reports yet
Nearest
Kane County, 66 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 552 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 37.3908, -112.5435. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kane County, UT 66 km (41 mi) WNW of here earthquakes near Kane County
Washington County, UT 85 km (53 mi) E of here earthquakes near Washington County
Iron County, UT 89 km (55 mi) SE of here earthquakes near Iron County
Garfield County, UT 108 km (67 mi) WSW of here earthquakes near Garfield County
Piute County, UT 111 km (69 mi) SSW of here earthquakes near Piute County
Beaver County, UT 124 km (77 mi) SSE of here earthquakes near Beaver 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 10 km E of Springdale, Utah
  2. 1.5 7 km NE of Hildale, Utah
  3. 2.2 11 km ENE of Kanarraville, Utah
  4. 1.7 11 km E of Kanarraville, Utah
  5. 1.6 11 km E of Kanarraville, Utah
  6. 2.3 11 km E of Kanarraville, Utah
  7. 2.9 11 km ENE of Kanarraville, Utah
  8. 2.2 11 km ENE of Kanarraville, Utah
  9. 2.6 11 km ENE of Kanarraville, Utah
  10. 1.8 11 km E of Kanarraville, Utah
  11. 2.5 11 km ENE of Kanarraville, Utah
  12. 1.5 12 km ENE of Kanarraville, Utah
  13. 2.0 25 km S of Brian Head, Utah
  14. 1.5 7 km NE of Hildale, Utah
  15. 2.0 9 km E of Springdale, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.5 on 2024-07-29 — it released about 8,800 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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