QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

32 km SSW of Segundo, Colorado

· 3.6 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Colfax County 31 kmCostilla County 72 kmTaos County 77 kmLas Animas County 88 kmHuerfano County 95 kmMora County 96 kmAlamosa County 117 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 2.8 (ml)
Depth
3.6 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Colfax County, 31 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 157 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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 36.8397, -104.8363. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Colfax County, NM 31 km (19 mi) NW of here earthquakes near Colfax County
Costilla County, CO 72 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 88 km (55 mi) SW of here earthquakes near Las Animas County
Huerfano County, CO 95 km (59 mi) S of here earthquakes near Huerfano County
Mora County, NM 96 km (59 mi) N of here earthquakes near Mora 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. 1.5 20 km SSW of Weston, Colorado
  2. 1.9 15 km SSE of Stonewall Gap, Colorado
  3. 2.9 16 km SSE of Stonewall Gap, Colorado
  4. 2.4 14 km SW of Weston, Colorado
  5. 3.8 16 km SSE of Stonewall Gap, Colorado
  6. 1.5 13 km SW of Weston, Colorado
  7. 1.7 14 km SSE of Stonewall Gap, Colorado
  8. 1.6 10 km SSE of Stonewall Gap, Colorado
  9. 1.9 30 km S of Segundo, Colorado
  10. 1.8 16 km SSE of Stonewall Gap, Colorado
  11. 1.8 14 km SW of Weston, Colorado
  12. 2.0 27 km S of Weston, Colorado
  13. 1.8 25 km S of Weston, Colorado
  14. 2.8 30 km S of Segundo, Colorado
  15. 2.0 27 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 180 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.