QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

15 km SW of Weston, Colorado

· 8.1 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Costilla County 50 kmColfax County 54 kmHuerfano County 73 kmTaos County 79 kmLas Animas County 87 kmAlamosa County 95 kmConejos County 110 kmMora 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 3.1 (ml)
Depth
8.1 km below the surface
Felt
5 reports · strongest reported intensity IV
Nearest
Costilla County, 50 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1161 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 5 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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 37.0280, -104.9561. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Costilla County, CO 50 km (31 mi) ESE of here earthquakes near Costilla County
Colfax County, NM 54 km (34 mi) NNW of here earthquakes near Colfax County
Huerfano County, CO 73 km (46 mi) S of here earthquakes near Huerfano County
Taos County, NM 79 km (49 mi) NE of here earthquakes near Taos County
Las Animas County, CO 87 km (54 mi) WSW of here earthquakes near Las Animas County
Alamosa County, CO 95 km (59 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

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

  1. 3.0 Colorado
  2. 3.2 9 km N of Segundo, Colorado
  3. 1.5 New Mexico
  4. 1.9 23 km S of Segundo, Colorado
  5. 1.9 24 km SSW of Segundo, Colorado
  6. 1.5 New Mexico
  7. 1.6 23 km SSW of Segundo, Colorado
  8. 1.6 New Mexico
  9. 1.6 23 km SSW of Segundo, Colorado
  10. 2.3 7 km N of Segundo, Colorado
  11. 2.0 23 km S of Weston, Colorado
  12. 2.2 New Mexico
  13. 2.0 20 km S of Weston, Colorado
  14. 1.8 23 km S of Weston, Colorado
  15. 3.4 24 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 4.3 on 2023-03-10 — 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.