Earthquake · reviewed by a seismologist
M 1.7ml
Colorado
Yes. A magnitude 1.7 earthquake was recorded in Colorado, at 11:08 am MDT on 18 April 2023 (17:08 UTC), 5.0 km deep.
- When
- Magnitude
- M 1.7 (ml)
- Depth
- 5.0 km below the surface
- Felt
- no reports yet
- Nearest
- Huerfano County, 56 km NNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1227 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 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. 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: Trinidad.
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
The largest earthquake within 50 km since 2016 was M 4.3 on 2023-03-10 — about 7,900 times the energy of this one.
Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:
- 5.3 6 km S of Valdez, Colorado · 17 km SSE of this epicentre
- 5.0 20 km S of Weston, Colorado · 30 km SSW 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 37.2094, -104.7499. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Huerfano County, CO | 56 km (35 mi) | NNW | earthquakes near Huerfano County |
| Costilla County, CO | 61 km (38 mi) | W | earthquakes near Costilla County |
| Las Animas County, CO | 64 km (40 mi) | E | earthquakes near Las Animas County |
| Colfax County, NM | 67 km (42 mi) | S | earthquakes near Colfax County |
| Alamosa County, CO | 100 km (62 mi) | WNW | earthquakes near Alamosa County |
| Taos County, NM | 106 km (66 mi) | SW | earthquakes near Taos County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
60 earthquakes have been recorded within 50 km since this one.
- 2.6 23 km S of Weston, Colorado
- 2.2 25 km S of Segundo, Colorado
- 2.2 7 km NNW of El Moro, Colorado
- 1.7 17 km SSE of Stonewall Gap, Colorado
- 2.2 13 km NNW of Weston, Colorado
- 1.7 12 km SSE of Stonewall Gap, Colorado
- 2.3 30 km NNE of Ute Park, New Mexico
- 1.8 18 km S of Weston, Colorado
- 1.6 25 km WSW of Raton, New Mexico
- 1.9 2 km S of Valdez, Colorado
- 1.7 5 km ENE of El Moro, Colorado
- 2.0 7 km NNW of El Moro, Colorado
- 1.6 9 km SSE of Stonewall Gap, Colorado
- 1.7 15 km S of Weston, Colorado
- 1.7 7 km NNW 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.