QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

30 km S of Weston, Colorado

· 5.0 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Colfax County 34 kmCostilla County 69 kmTaos County 76 kmLas Animas County 89 kmHuerfano County 93 kmMora County 97 kmAlamosa County 114 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 1.5 (ml)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Colfax County, 34 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1386 days ago

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

How big was it?

This earthquake released about 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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 36.8556, -104.8652. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Colfax County, NM 34 km (21 mi) NW of here earthquakes near Colfax County
Costilla County, CO 69 km (43 mi) SE of here earthquakes near Costilla County
Taos County, NM 76 km (47 mi) ENE of here earthquakes near Taos County
Las Animas County, CO 89 km (55 mi) SW of here earthquakes near Las Animas County
Huerfano County, CO 93 km (58 mi) S of here earthquakes near Huerfano County
Mora County, NM 97 km (60 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

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

  1. 1.8 12 km SSE of Stonewall Gap, Colorado
  2. 1.8 16 km NNE of Weston, Colorado
  3. 2.0 11 km NNW of Segundo, Colorado
  4. 1.7 6 km NNE of Segundo, Colorado
  5. 1.8 8 km N of Segundo, Colorado
  6. 2.9 8 km N of Segundo, Colorado
  7. 2.2 8 km N of Segundo, Colorado
  8. 1.7 29 km NNE of Ute Park, New Mexico
  9. 1.5 9 km N of Segundo, Colorado
  10. 1.6 10 km N of Segundo, Colorado
  11. 1.5 Colorado
  12. 3.2 6 km NNW of Segundo, Colorado
  13. 1.5 8 km N of Segundo, Colorado
  14. 1.8 11 km NNW of Segundo, Colorado
  15. 2.4 8 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 4.2 on 2016-12-23 — it released about 11,000 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.