QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9mb_lg

19 km NNW of Weston, Colorado

· 5.0 km deep · released about 680 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Huerfano County 43 kmCostilla County 46 kmLas Animas County 76 kmColfax County 81 kmAlamosa County 83 kmCuster County 98 kmPueblo County 102 kmTaos County 104 kmConejos County 113 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 2.9 (mb_lg)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Huerfano County, 43 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3099 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 680 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 680 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 37.3058, -104.9046. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Huerfano County, CO 43 km (27 mi) S of here earthquakes near Huerfano County
Costilla County, CO 46 km (29 mi) E of here earthquakes near Costilla County
Las Animas County, CO 76 km (47 mi) W of here earthquakes near Las Animas County
Colfax County, NM 81 km (50 mi) NNW of here earthquakes near Colfax County
Alamosa County, CO 83 km (52 mi) ESE of here earthquakes near Alamosa County
Custer County, CO 98 km (61 mi) SSE of here earthquakes near Custer County

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

Aftershocks so far

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

  1. 2.7 26 km S of Segundo, Colorado
  2. 3.5 16 km NNW of Weston, Colorado
  3. 1.9 15 km NNW of Weston, Colorado
  4. 2.0 12 km NNW of El Moro, Colorado
  5. 1.5 11 km SSE of Stonewall Gap, Colorado
  6. 1.5 13 km SSE of Stonewall Gap, Colorado
  7. 1.9 16 km SSW of Weston, Colorado
  8. 1.6 17 km SSW of Weston, Colorado
  9. 1.5 13 km SSE of Stonewall Gap, Colorado
  10. 2.0 13 km SSE of Stonewall Gap, Colorado
  11. 1.6 12 km SSE of Stonewall Gap, Colorado
  12. 1.6 16 km SSW of Weston, Colorado
  13. 1.8 16 km S of Stonewall Gap, Colorado
  14. 1.7 14 km SSE of Stonewall Gap, Colorado
  15. 2.1 16 km SSE of Stonewall Gap, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.0 on 2016-02-06 — it released about 45 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.