Earthquake · reviewed by a seismologist
M 2.7ml
Earthquake near Trinidad, CO
No earthquake was likely felt in Trinidad in the 24 hours to 7:47 am MST (14:47 UTC). The last one was M 3.4, 45 km (28 mi) WSW, at 3:34 am MST on 8 November 2026, estimated intensity III (weak) in town; 2 felt reports to USGS. Every earthquake near Trinidad
This page: a magnitude 2.7 earthquake was recorded 27 km (17 mi) north-northeast of Trinidad, CO, at 1:12 am MST on 28 November 2021 (08:12 UTC), 4.8 km deep. 1 person has reported feeling it to USGS.
USGS: 11 km NNE of Hoehne, Colorado
- When
- 1:12 am MST on 28 November 2021 ()
- Where
- 27 km (17 mi) north-northeast of Trinidad, CO · earthquakes near Trinidad
- Magnitude
- M 2.7 (ml)
- Depth
- 4.8 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- Las Animas County, 28 km ESE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1740 days ago
Earthquake alerts for Trinidad, 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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 56 km (35 mi) from the epicentre. In Trinidad, 27 km away, the estimate is intensity III (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.
Likely felt in: Trinidad 27 km, intensity III · Walsenburg 46 km, intensity II. Estimated for each town centre; each link is that town's own record.
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.
- Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
- Magna, Utah 2020 M 5.7 32,000× the energy of this one
- Around the size people start to feel M 3.0 2.8× the energy of this one
- 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
The largest earthquake within 50 km since 2016 was M 4.0 on 2017-12-30 — about 89 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.3 6 km S of Valdez, Colorado · 47 km SW of this epicentre
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 37.3819, -104.3529. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Las Animas County, CO | 28 km (18 mi) | ESE | earthquakes near Las Animas County |
| Huerfano County, CO | 63 km (39 mi) | WNW | earthquakes near Huerfano County |
| Otero County, CO | 79 km (49 mi) | NE | earthquakes near Otero County |
| Pueblo County, CO | 88 km (54 mi) | N | earthquakes near Pueblo County |
| Colfax County, NM | 89 km (55 mi) | SSW | earthquakes near Colfax County |
| Costilla County, CO | 96 km (60 mi) | W | earthquakes near Costilla County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
48 earthquakes have been recorded within 50 km since this one.
- 1.8 8 km N of Segundo, Colorado
- 1.8 8 km N of Segundo, Colorado
- 2.5 7 km N of Segundo, Colorado
- 2.5 7 km N of Segundo, Colorado
- 1.8 9 km N of Segundo, Colorado
- 4.3 6 km NNE of Segundo, Colorado
- 1.8 7 km N of Segundo, Colorado
- 1.8 8 km N of Segundo, Colorado
- 2.0 8 km N of Segundo, Colorado
- 2.6 4 km WNW of El Moro, Colorado
- 1.6 7 km N of Segundo, Colorado
- 2.4 6 km W of El Moro, Colorado
- 3.1 6 km NNW of Trinidad, Colorado
- 1.7 5 km WNW of El Moro, Colorado
- 1.6 6 km W of El Moro, 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.