QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

29 km SSE of South Fork, Colorado

· 5.0 km deep · released about 7.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Rio Grande County 13 kmConejos County 41 kmMineral County 41 kmArchuleta County 48 kmAlamosa County 71 kmSaguache County 75 kmHinsdale County 84 kmRio Arriba County 101 kmCostilla County 102 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 1.6 (ml)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Rio Grande County, 13 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2712 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 7.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.6 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 37.4090, -106.5710. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Rio Grande County, CO 13 km (8 mi) SW of here earthquakes near Rio Grande County
Conejos County, CO 41 km (26 mi) WNW of here earthquakes near Conejos County
Mineral County, CO 41 km (26 mi) ESE of here earthquakes near Mineral County
Archuleta County, CO 48 km (30 mi) ENE of here earthquakes near Archuleta County
Alamosa County, CO 71 km (44 mi) WSW of here earthquakes near Alamosa County
Saguache County, CO 75 km (47 mi) SSW of here earthquakes near Saguache County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 1.5 28 km E of Pagosa Springs, Colorado
  2. 1.6 23 km SSW of South Fork, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.