Earthquake · reviewed by a seismologist
M 1.7mb_lg
Earthquake near Las Animas, CO
No earthquake was likely felt in Las Animas in the 24 hours to 7:40 am MST (14:40 UTC). The last one was M 3.4, 190 km (118 mi) SW, at 3:34 am MST on 8 November 2026, estimated intensity II (weak) in town; 2 felt reports to USGS. Every earthquake near Las Animas
This page: a magnitude 1.7 earthquake was recorded 49 km (30 mi) north-northeast of Las Animas, CO, at 8:22 pm MDT on 15 September 2021 (02:22 UTC), 5.0 km deep.
USGS: 14 km E of Haswell, Colorado
- When
- 8:22 pm MDT on 15 September 2021 ()
- Where
- 49 km (30 mi) north-northeast of Las Animas, CO · earthquakes near Las Animas
- Magnitude
- M 1.7 (mb_lg)
- Depth
- 5.0 km below the surface
- Felt
- no reports yet
- Nearest
- Kiowa County, 22 km ESE
- Nearest mapped fault
- Cheraw fault, 5 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1814 days ago
Earthquake alerts for Las Animas, CO
Get a notification in this browser when USGS records an earthquake near Las Animas, CO. No account or email needed.
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 11 km (7 mi) from the epicentre. In Las Animas, 49 km away, the estimate is intensity I (not felt). 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.
How big was it?
This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
- Around the size people start to feel M 3.0 89× the energy of this one
- This earthquake M 1.7 about 11 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 38.4656, -102.9941. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Kiowa County, CO | 22 km (14 mi) | ESE | earthquakes near Kiowa County |
| Cheyenne County, CO | 53 km (33 mi) | NE | earthquakes near Cheyenne County |
| Bent County, CO | 60 km (37 mi) | S | earthquakes near Bent County |
| Crowley County, CO | 70 km (44 mi) | WSW | earthquakes near Crowley County |
| Lincoln County, CO | 74 km (46 mi) | NW | earthquakes near Lincoln County |
| Prowers County, CO | 77 km (48 mi) | SE | earthquakes near Prowers County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
7 earthquakes have been recorded within 50 km since this one.
- 1.8 6 km SW of Eads, Colorado
- 1.6 12 km ESE of Eads, Colorado
- 2.4 18 km NW of Eads, Colorado
- 1.7 11 km NNE of Wiley, Colorado
- 2.1 16 km WNW of Haswell, Colorado
- 1.9 6 km SW of Kit Carson, Colorado
- 2.2 15 km NW of Eads, 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.