QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

Earthquake near Basalt, CO

USGS: 5 km N of Basalt, Colorado

10:36 pm MDT, Apr 1, 2019 · · 5.0 km deep · released about 21 lb of TNT

Every earthquake near Basalt Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Pitkin County 24 kmEagle County 37 kmLake County 63 kmGarfield County 78 kmSummit County 80 kmGunnison County 83 kmDelta County 95 kmChaffee County 99 kmGrand County 110 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
10:36 pm MDT on 1 April 2019 ()
Where
5 km (3 mi) N of Basalt, CO · earthquakes near Basalt
Magnitude
M 1.9 (ml)
Depth
5.0 km below the surface
Felt
2 reports · strongest reported intensity IV
Nearest
Pitkin County, 24 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2663 days ago

A magnitude 1.9 earthquake was recorded 5 km (3 mi) N of Basalt, CO, at 10:36 pm MDT on 1 April 2019 (04:36 UTC). 2 people have reported feeling it to USGS. This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

Earthquakes near other towns within 30 km: El Jebel, Carbondale, Snowmass Village, Gypsum, Glenwood Springs.

How big was it?

This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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 39.4156, -107.0314. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Pitkin County, CO 24 km (15 mi) SSE earthquakes near Pitkin County
Eagle County, CO 37 km (23 mi) NE earthquakes near Eagle County
Lake County, CO 63 km (39 mi) ESE earthquakes near Lake County
Garfield County, CO 78 km (49 mi) WNW earthquakes near Garfield County
Summit County, CO 80 km (50 mi) ENE earthquakes near Summit County
Gunnison County, CO 83 km (51 mi) S earthquakes near Gunnison County

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

Aftershocks so far

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

  1. 2.2 10 km NW of Dotsero, Colorado
  2. 2.8 10 km NE of Redstone, Colorado
  3. 2.6 12 km S of Mulford, Colorado
  4. 2.1 6 km NNW of Chacra, Colorado
  5. 2.9 6 km NNE of Chacra, Colorado
  6. 1.9 6 km WNW of Snowmass Village, Colorado
  7. 2.5 7 km NNW of Chacra, Colorado
  8. 2.6 6 km NNW of Chacra, Colorado
  9. 2.9 8 km NNW of Chacra, Colorado
  10. 2.1 9 km NNE of New Castle, Colorado
  11. 2.5 6 km NNW of Gypsum, Colorado
  12. 1.8 2 km NNW of El Jebel, Colorado
  13. 2.8 9 km E of Woody Creek, Colorado
  14. 1.7 15 km NW of Dotsero, Colorado
  15. 2.0 6 km E of Basalt, 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.