Earthquake · reviewed by a seismologist
M 1.9ml
Earthquake near Greeley, CO
No earthquake was likely felt in Greeley in the 24 hours to 1:19 pm MST (20:19 UTC). The last one was M 5.0, 599 km (372 mi) SE, at 4:21 am MDT on 23 July 2026, estimated intensity II (weak) in town; 499 felt reports to USGS. Every earthquake near Greeley
This page: a magnitude 1.9 earthquake was recorded 6 km (3 mi) east-northeast of Greeley, CO, at 12:16 am MDT on 27 March 2017 (06:16 UTC), 8.0 km deep. 1 person has reported feeling it to USGS.
USGS: 5 km ENE of Greeley, Colorado
11 km (7 mi) ENE of Greeley, CO
- When
- 12:16 am MDT on 27 March 2017 ()
- Where
- 6 km (3 mi) east-northeast of Greeley, CO · earthquakes near Greeley
- Magnitude
- M 1.9 (ml)
- Depth
- 8.0 km below the surface
- Felt
- 1 report · strongest reported intensity III
- Nearest
- Weld County, 26 km ENE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3436 days ago
Earthquake alerts for Greeley, CO
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 19 km (12 mi) from the epicentre. In Greeley, 6 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
Earthquakes near other towns within 30 km: Evans, Eaton, Kersey, La Salle, Ault, Severance.
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.
- Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
- Magna, Utah 2020 M 5.7 500,000× the energy of this one
- Around the size people start to feel M 3.0 45× the energy of this one
- 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 40.4493, -104.6523. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Weld County, CO | 26 km (16 mi) | ENE | earthquakes near Weld County |
| Broomfield County, CO | 65 km (40 mi) | SSW | earthquakes near Broomfield County |
| Adams County, CO | 69 km (43 mi) | SSE | earthquakes near Adams County |
| Morgan County, CO | 74 km (46 mi) | ESE | earthquakes near Morgan County |
| Larimer County, CO | 74 km (46 mi) | WNW | earthquakes near Larimer County |
| Boulder County, CO | 75 km (46 mi) | WSW | earthquakes near Boulder County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
8 earthquakes have been recorded within 50 km since this one.
- 2.3 2 km SW of Gilcrest, Colorado
- 2.3 4 km ENE of Greeley, Colorado
- 1.9 8 km ENE of Greeley, Colorado
- 2.9 7 km NE of Greeley, Colorado
- 2.3 8 km ENE of Greeley, Colorado
- 1.7 7 km ENE of Greeley, Colorado
- 2.3 8 km ENE of Greeley, Colorado
- 2.1 5 km NE of Greeley, 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.