QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4ml

Colorado

Yes. A magnitude 2.4 earthquake was recorded in Colorado, at 3:28 pm MDT on 29 June 2023 (21:28 UTC), 5.4 km deep.

· 5.4 km deep · released about 120 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Las Animas County 39 kmHuerfano County 61 kmColfax County 77 kmCostilla County 84 kmOtero County 94 kmPueblo County 97 kmAlamosa County 120 kmCuster County 120 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 2.4 (ml)
Depth
5.4 km below the surface
Felt
no reports yet
Nearest
Las Animas County, 39 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1160 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 41 km (25 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Trinidad 14 km, intensity III. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 89,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.9× the energy of this one
  4. This earthquake M 2.4 about 120 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.

For this area

The largest earthquake within 50 km since 2016 was M 4.3 on 2023-03-10 — about 710 times the energy of this one.

Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:

  1. 5.3 6 km S of Valdez, Colorado · 32 km SW of this epicentre
  2. 5.0 20 km S of Weston, Colorado · 50 km SW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 37.2915, -104.4785. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Las Animas County, CO 39 km (24 mi) E earthquakes near Las Animas County
Huerfano County, CO 61 km (38 mi) NW earthquakes near Huerfano County
Colfax County, NM 77 km (48 mi) S earthquakes near Colfax County
Costilla County, CO 84 km (52 mi) W earthquakes near Costilla County
Otero County, CO 94 km (58 mi) NE earthquakes near Otero County
Pueblo County, CO 97 km (60 mi) N earthquakes near Pueblo County

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

Aftershocks so far

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

  1. 1.5 8 km SE of Walsenburg, Colorado
  2. 2.6 12 km SSE of Walsenburg, Colorado
  3. 1.5 7 km N of El Moro, Colorado
  4. 1.6 15 km SSW of Weston, Colorado
  5. 1.7 18 km S of Weston, Colorado
  6. 1.5 Colorado
  7. 3.0 Colorado
  8. 3.2 9 km N of Segundo, Colorado
  9. 1.5 New Mexico
  10. 2.3 7 km N of Segundo, Colorado
  11. 2.2 7 km NNW of El Moro, Colorado
  12. 2.2 13 km NNW of Weston, Colorado
  13. 1.8 18 km S of Weston, Colorado
  14. 1.9 2 km S of Valdez, Colorado
  15. 1.7 5 km ENE of El Moro, 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.