QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

Earthquake near Glenwood Springs, CO

USGS: 28 km NNE of Chacra, Colorado

1:01 am MDT, Apr 7, 2018 · · 4.3 km deep · released about 340 lb of TNT

Every earthquake near Glenwood Springs Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Garfield County 52 kmEagle County 62 kmRio Blanco County 73 kmPitkin County 78 kmRoutt County 80 kmSummit County 108 kmLake County 111 kmGrand County 112 kmMoffat County 113 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
1:01 am MDT on 7 April 2018 ()
Where
31 km (19 mi) N of Glenwood Springs, CO · earthquakes near Glenwood Springs
Magnitude
M 2.7 (ml)
Depth
4.3 km below the surface
Felt
4 reports · strongest reported intensity II
Nearest
Garfield County, 52 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2853 days ago

A magnitude 2.7 earthquake was recorded 31 km (19 mi) N of Glenwood Springs, CO, at 1:01 am MDT on 7 April 2018 (07:01 UTC). 4 people have reported feeling it to USGS. 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 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 39.8234, -107.3699. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Garfield County, CO 52 km (33 mi) WSW earthquakes near Garfield County
Eagle County, CO 62 km (38 mi) ESE earthquakes near Eagle County
Rio Blanco County, CO 73 km (45 mi) WNW earthquakes near Rio Blanco County
Pitkin County, CO 78 km (48 mi) SSE earthquakes near Pitkin County
Routt County, CO 80 km (50 mi) NNE earthquakes near Routt County
Summit County, CO 108 km (67 mi) ESE earthquakes near Summit County

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

Aftershocks so far

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

  1. 2.0 17 km WSW of Phippsburg, Colorado
  2. 1.9 26 km WSW of Yampa, Colorado
  3. 2.0 29 km WSW of Yampa, Colorado
  4. 2.2 10 km NW of Dotsero, Colorado
  5. 2.5 30 km NNW of Dotsero, Colorado
  6. 2.1 6 km NNW of Chacra, Colorado
  7. 2.5 22 km NNW of New Castle, Colorado
  8. 2.9 6 km NNE of Chacra, Colorado
  9. 2.5 7 km NNW of Chacra, Colorado
  10. 2.6 6 km NNW of Chacra, Colorado
  11. 2.9 8 km NNW of Chacra, Colorado
  12. 2.1 9 km NNE of New Castle, Colorado
  13. 2.5 6 km NNW of Gypsum, Colorado
  14. 1.7 15 km NW of Dotsero, Colorado
  15. 2.4 19 km NNE of Chacra, 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.