QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0mb

Colorado

· 1.6 km deep · released about 15 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Costilla County 47 kmColfax County 60 kmHuerfano County 67 kmTaos County 83 kmLas Animas County 85 kmAlamosa County 91 kmConejos County 109 kmCuster County 119 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 (mb)
Depth
1.6 km below the surface
Felt
6 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Nearest
Costilla County, 47 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1512 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 6 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 37.0868, -104.9570. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Costilla County, CO 47 km (29 mi) ESE of here earthquakes near Costilla County
Colfax County, NM 60 km (37 mi) NNW of here earthquakes near Colfax County
Huerfano County, CO 67 km (42 mi) S of here earthquakes near Huerfano County
Taos County, NM 83 km (52 mi) NE of here earthquakes near Taos County
Las Animas County, CO 85 km (53 mi) WSW of here earthquakes near Las Animas County
Alamosa County, CO 91 km (56 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

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

  1. 3.8 15 km SSE of Stonewall Gap, Colorado
  2. 1.7 6 km WNW of El Moro, Colorado
  3. 2.1 17 km SSE of Stonewall Gap, Colorado
  4. 1.5 5 km SSW of Weston, Colorado
  5. 2.0 12 km SW of Weston, Colorado
  6. 1.5 11 km SW of Weston, Colorado
  7. 2.7 31 km SSW of Weston, Colorado
  8. 1.8 14 km SSW of Aguilar, Colorado
  9. 1.5 15 km SW of Aguilar, Colorado
  10. 2.7 16 km SSW of Sequndo, Colorado
  11. 2.9 31 km S of Weston, Colorado
  12. 1.7 16 km SW of Aguilar, Colorado
  13. 1.9 16 km SSW of Sequndo, Colorado
  14. 3.1 12 km SSW of Segundo, Colorado
  15. 2.3 13 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.

On USGS

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