QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

21 km WSW of Beulah Valley, Colorado

· 5.0 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Custer County 23 kmHuerfano County 37 kmFremont County 58 kmPueblo County 64 kmAlamosa County 70 kmCostilla County 81 kmSaguache County 94 kmTeller County 100 kmEl Paso County 110 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
5.0 km below the surface
Felt
no reports yet
Nearest
Custer County, 23 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 157 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 37.9725, -105.1701. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Custer County, CO 23 km (14 mi) SE of here earthquakes near Custer County
Huerfano County, CO 37 km (23 mi) NNW of here earthquakes near Huerfano County
Fremont County, CO 58 km (36 mi) SSE of here earthquakes near Fremont County
Pueblo County, CO 64 km (40 mi) WSW of here earthquakes near Pueblo County
Alamosa County, CO 70 km (44 mi) NE of here earthquakes near Alamosa County
Costilla County, CO 81 km (50 mi) NNE of here earthquakes near Costilla County

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

Aftershocks so far

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

  1. 2.5 12 km NNW of Walsenburg, Colorado
  2. 2.4 15 km ENE of Colorado City, Colorado

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.