QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

11 km N of Segundo, Colorado

· 2.3 km deep · released about 950 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Huerfano County 54 kmCostilla County 60 kmLas Animas County 63 kmColfax County 69 kmAlamosa County 99 kmPueblo County 106 kmTaos County 107 kmCuster County 111 kmOtero 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
2.3 km below the surface
Felt
10 reports · strongest reported intensity V
Nearest
Huerfano County, 54 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1231 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 10 people have reported feeling it to USGS.

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 37.2293, -104.7515. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Huerfano County, CO 54 km (34 mi) SSE of here earthquakes near Huerfano County
Costilla County, CO 60 km (37 mi) E of here earthquakes near Costilla County
Las Animas County, CO 63 km (39 mi) W of here earthquakes near Las Animas County
Colfax County, NM 69 km (43 mi) N of here earthquakes near Colfax County
Alamosa County, CO 99 km (62 mi) ESE of here earthquakes near Alamosa County
Pueblo County, CO 106 km (66 mi) SSW of here earthquakes near Pueblo County

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

Aftershocks so far

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

  1. 2.3 7 km N of El Moro, Colorado
  2. 2.1 10 km SW of Weston, Colorado
  3. 1.6 13 km SW of Weston, Colorado
  4. 1.9 New Mexico
  5. 2.6 16 km SSW of Weston, Colorado
  6. 1.5 New Mexico
  7. 2.1 7 km WNW of Hoehne, Colorado
  8. 1.5 10 km NNE of Weston, Colorado
  9. 1.7 31 km S of Segundo, Colorado
  10. 2.8 18 km S of Stonewall Gap, Colorado
  11. 3.1 15 km SW of Weston, Colorado
  12. 2.5 7 km N of El Moro, Colorado
  13. 2.3 8 km N of Segundo, Colorado
  14. 1.7 8 km N of Segundo, Colorado
  15. 2.1 7 km N of Segundo, 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 89 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.