QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

13 km SE of Cortez, Colorado

· 10 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Montezuma County 13 kmDolores County 50 kmLa Plata County 55 kmSan Miguel County 81 kmSan Juan County 87 kmSan Juan County 89 kmHinsdale County 112 kmOuray 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 1.8 (ml)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Montezuma County, 13 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2338 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 37.2831, -108.4634. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Montezuma County, CO 13 km (8 mi) ESE of here earthquakes near Montezuma County
Dolores County, CO 50 km (31 mi) S of here earthquakes near Dolores County
La Plata County, CO 55 km (34 mi) W of here earthquakes near La Plata County
San Miguel County, CO 81 km (50 mi) S of here earthquakes near San Miguel County
San Juan County, NM 87 km (54 mi) N of here earthquakes near San Juan County
San Juan County, CO 89 km (55 mi) SW of here earthquakes near San Juan 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. 2.1 9 km SW of Mancos, Colorado
  2. 2.0 25 km WSW of Lewis, 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.