QuakeIndex

Earthquake · reviewed by a seismologist

M 3.8ml

34 km SSW of Segundo, Colorado

· 4.4 km deep · released about 7.6 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Colfax County 29 kmCostilla County 73 kmTaos County 77 kmLas Animas County 89 kmMora County 94 kmHuerfano County 97 kmAlamosa County 118 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 3.8 (ml)
Depth
4.4 km below the surface
Felt
8 reports · strongest reported intensity III
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Nearest
Colfax County, 29 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 7 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 8 people have reported feeling it to USGS.

How big was it?

This earthquake released about 7.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 22,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 710× the energy of this one
  4. This earthquake M 3.8 about 7.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 16× 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 36.8248, -104.8322. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Colfax County, NM 29 km (18 mi) NW of here earthquakes near Colfax County
Costilla County, CO 73 km (45 mi) SE of here earthquakes near Costilla County
Taos County, NM 77 km (48 mi) ENE of here earthquakes near Taos County
Las Animas County, CO 89 km (55 mi) SW of here earthquakes near Las Animas County
Mora County, NM 94 km (58 mi) N of here earthquakes near Mora County
Huerfano County, CO 97 km (60 mi) S of here earthquakes near Huerfano 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. 1.7 33 km NNE of Cimarron, New Mexico
  2. 2.4 21 km S of Weston, Colorado
  3. 1.6 15 km SSE of Stonewall Gap, Colorado
  4. 1.8 18 km NNE of Ute Park, New Mexico
  5. 2.6 15 km SSE of Stonewall Gap, Colorado
  6. 3.4 31 km S of Weston, Colorado
  7. 1.7 12 km SSE of Stonewall Gap, Colorado
  8. 1.8 11 km S of Weston, Colorado
  9. 1.5 9 km SE of Starkville, Colorado
  10. 1.6 10 km SSE of Stonewall Gap, Colorado
  11. 1.6 17 km SSE of Stonewall Gap, Colorado
  12. 1.5 10 km SSE of Stonewall Gap, Colorado
  13. 1.5 7 km SSW of Weston, Colorado
  14. 1.9 30 km S of Segundo, Colorado
  15. 2.1 15 km S 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.3 on 2023-03-10 — it released about 5.6 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.