QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

22 km SSW of Weston, Colorado

· 8.2 km deep · released about 950 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Colfax County 43 kmCostilla County 60 kmTaos County 76 kmHuerfano County 84 kmLas Animas County 88 kmAlamosa County 105 kmMora County 106 kmConejos County 116 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 3.0 (ml)
Depth
8.2 km below the surface
Felt
no reports yet
Nearest
Colfax County, 43 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2010 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 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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 36.9343, -104.9136. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Colfax County, NM 43 km (27 mi) NW of here earthquakes near Colfax County
Costilla County, CO 60 km (37 mi) SE of here earthquakes near Costilla County
Taos County, NM 76 km (47 mi) ENE of here earthquakes near Taos County
Huerfano County, CO 84 km (52 mi) S of here earthquakes near Huerfano County
Las Animas County, CO 88 km (55 mi) WSW of here earthquakes near Las Animas County
Alamosa County, CO 105 km (65 mi) SE of here earthquakes near Alamosa 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. 2.9 12 km SSW of Weston, Colorado
  2. 1.8 14 km S of Weston, Colorado
  3. 1.5 17 km SSW of Weston, Colorado
  4. 1.8 31 km S of Segundo, Colorado
  5. 2.6 16 km S of Weston, Colorado
  6. 1.6 14 km S of Stonewall Gap, Colorado
  7. 1.5 14 km SSE of Stonewall Gap, Colorado
  8. 1.6 14 km S of Weston, Colorado
  9. 1.8 New Mexico
  10. 2.8 15 km S of Weston, Colorado
  11. 2.1 25 km SSW of Segundo, Colorado
  12. 1.7 31 km S of Stonewall Gap, Colorado
  13. 1.5 22 km NNE of Cimarron, New Mexico
  14. 2.3 29 km SSW of Weston, Colorado
  15. 2.1 30 km S of Weston, 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 4.2 on 2016-12-23 — it released about 63 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.