QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0mwr

15 km N of Weston, Colorado

· 4.0 km deep · released about 15 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Huerfano County 47 kmCostilla County 50 kmLas Animas County 73 kmColfax County 76 kmAlamosa County 88 kmCuster County 102 kmTaos County 104 kmPueblo County 104 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 4.0 (mwr)
Depth
4.0 km below the surface
Felt
55 reports · strongest reported intensity V
Measured shaking
intensity IV (ShakeMap)
USGS impact alert
green
Nearest
Huerfano County, 47 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2791 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 55 people have reported feeling it to USGS.

How big was it?

This earthquake released about 15 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 11,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 500× the energy of this one
  3. Magna, Utah 2020 M 5.7 350× the energy of this one
  4. This earthquake M 4.0 about 15 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 32× more

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 37.2734, -104.8631. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Huerfano County, CO 47 km (29 mi) S of here earthquakes near Huerfano County
Costilla County, CO 50 km (31 mi) E of here earthquakes near Costilla County
Las Animas County, CO 73 km (45 mi) W of here earthquakes near Las Animas County
Colfax County, NM 76 km (47 mi) NNW of here earthquakes near Colfax County
Alamosa County, CO 88 km (55 mi) ESE of here earthquakes near Alamosa County
Custer County, CO 102 km (64 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

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

  1. 1.9 15 km NNW of Weston, Colorado
  2. 2.0 12 km NNW of El Moro, Colorado
  3. 1.5 11 km SSE of Stonewall Gap, Colorado
  4. 1.5 13 km SSE of Stonewall Gap, Colorado
  5. 1.9 16 km SSW of Weston, Colorado
  6. 1.6 17 km SSW of Weston, Colorado
  7. 1.5 13 km SSE of Stonewall Gap, Colorado
  8. 2.0 13 km SSE of Stonewall Gap, Colorado
  9. 1.6 12 km SSE of Stonewall Gap, Colorado
  10. 1.6 16 km SSW of Weston, Colorado
  11. 1.8 16 km S of Stonewall Gap, Colorado
  12. 1.7 14 km SSE of Stonewall Gap, Colorado
  13. 2.1 16 km SSE of Stonewall Gap, Colorado
  14. 2.8 16 km SSE of Stonewall Gap, Colorado
  15. 1.6 15 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.

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

On USGS

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