QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3mwr

22 km N of Blanca, Colorado

· 5.7 km deep · released about 1.3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alamosa County 27 kmCostilla County 41 kmHuerfano County 47 kmCuster County 52 kmConejos County 77 kmSaguache County 78 kmRio Grande County 86 kmFremont County 91 kmPueblo County 106 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 3.3 (mwr)
Depth
5.7 km below the surface
Felt
22 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
Alamosa County, 27 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2693 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 22 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 130,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,000× the energy of this one
  4. This earthquake M 3.3 about 1.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.8× 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 37.6432, -105.4965. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alamosa County, CO 27 km (17 mi) ENE of here earthquakes near Alamosa County
Costilla County, CO 41 km (26 mi) N of here earthquakes near Costilla County
Huerfano County, CO 47 km (30 mi) W of here earthquakes near Huerfano County
Custer County, CO 52 km (32 mi) SSW of here earthquakes near Custer County
Conejos County, CO 77 km (48 mi) NE of here earthquakes near Conejos County
Saguache County, CO 78 km (48 mi) ESE of here earthquakes near Saguache County

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

Aftershocks so far

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

  1. 2.4 2 km WNW of La Veta, Colorado
  2. 1.7 4 km W of La Veta, Colorado
  3. 1.5 20 km N of Blanca, Colorado
  4. 1.7 Colorado
  5. 1.5 26 km N of Fort Garland, Colorado
  6. 1.5 22 km N of Blanca, Colorado
  7. 2.1 23 km N of Blanca, Colorado
  8. 1.6 22 km N of Blanca, Colorado
  9. 2.3 22 km N of Blanca, Colorado
  10. 1.6 Colorado
  11. 1.7 24 km N of Blanca, Colorado
  12. 2.0 25 km N of Blanca, Colorado
  13. 1.5 21 km N of Blanca, Colorado
  14. 1.7 25 km N of Blanca, Colorado
  15. 1.7 23 km N of Blanca, 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.