QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

15 km SSW 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 49 kmCostilla County 56 kmHuerfano County 77 kmTaos County 81 kmLas Animas County 84 kmAlamosa County 101 kmMora County 113 kmConejos County 115 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, 49 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1018 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 37.0006, -104.9035. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Colfax County, NM 49 km (30 mi) NNW of here earthquakes near Colfax County
Costilla County, CO 56 km (35 mi) ESE of here earthquakes near Costilla County
Huerfano County, CO 77 km (48 mi) S of here earthquakes near Huerfano County
Taos County, NM 81 km (50 mi) NE of here earthquakes near Taos County
Las Animas County, CO 84 km (52 mi) WSW of here earthquakes near Las Animas County
Alamosa County, CO 101 km (62 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

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

  1. 1.9 10 km NNW of El Moro, Colorado
  2. 2.0 15 km SW of Weston, Colorado
  3. 1.5 27 km S of Segundo, Colorado
  4. 1.6 25 km SSW of Segundo, Colorado
  5. 1.7 16 km S of Weston, Colorado
  6. 1.5 25 km SSW of Segundo, Colorado
  7. 2.3 16 km SSW of Weston, Colorado
  8. 1.5 14 km SSW of Weston, Colorado
  9. 2.5 6 km NNW of El Moro, Colorado
  10. 1.6 9 km NNW of El Moro, Colorado
  11. 1.5 9 km NNW of El Moro, Colorado
  12. 2.5 8 km NNW of El Moro, Colorado
  13. 1.5 8 km NNW of El Moro, Colorado
  14. 2.4 8 km NNW of El Moro, Colorado
  15. 2.9 8 km NNW 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.3 on 2023-03-10 — it released about 16,000 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.