QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8mb_lg

14 km SSE of Stonewall Gap, Colorado

· 7.8 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Costilla County 49 kmColfax County 55 kmHuerfano County 73 kmTaos County 79 kmLas Animas County 88 kmAlamosa County 94 kmConejos County 109 kmMora 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 (mb_lg)
Depth
7.8 km below the surface
Felt
no reports yet
Nearest
Costilla County, 49 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2192 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

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 37.0328, -104.9643. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Costilla County, CO 49 km (31 mi) ESE of here earthquakes near Costilla County
Colfax County, NM 55 km (34 mi) NNW of here earthquakes near Colfax County
Huerfano County, CO 73 km (45 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 88 km (54 mi) WSW of here earthquakes near Las Animas County
Alamosa County, CO 94 km (58 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

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

  1. 2.7 31 km S of Segundo, Colorado
  2. 1.5 13 km NNW of Cokedale, Colorado
  3. 3.0 Colorado
  4. 1.6 15 km W of Aguilar, Colorado
  5. 1.5 13 km SSE of Stonewall Gap, Colorado
  6. 1.9 15 km SSW of Weston, Colorado
  7. 2.3 15 km SW of Weston, Colorado
  8. 1.7 13 km SSE of Stonewall Gap, Colorado
  9. 1.6 13 km SSE of Stonewall Gap, Colorado
  10. 1.6 17 km SSE of Stonewall Gap, Colorado
  11. 2.3 28 km NNE of Ute Park, New Mexico
  12. 2.6 23 km NE of Ute Park, New Mexico
  13. 4.0 25 km N of Cimarron, New Mexico
  14. 3.2 26 km N of Cimarron, New Mexico
  15. 2.1 12 km W of Aguilar, 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 4.2 on 2016-12-23 — it released about 130 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.