Earthquake · reviewed by a seismologist
M 2.3ml
Earthquake near Bailey, CO
No earthquake was likely felt in Bailey in the 24 hours to 4:59 pm MST (23:59 UTC). The last one was M 5.0, 555 km (345 mi) SE, at 4:21 am MDT on 23 July 2026, estimated intensity III (weak) in town; 499 felt reports to USGS. Every earthquake near Bailey
This page: a magnitude 2.3 earthquake was recorded 7 km (4 mi) north of Bailey, CO, at 4:20 am MDT on 1 October 2016 (10:20 UTC), 5.0 km deep. 32 people have reported feeling it to USGS.
USGS: 18 km WSW of Aspen Park, Colorado
61 km (38 mi) WSW of Denver, CO · 41 km (25 mi) SW of Lakewood, CO
- When
- 4:20 am MDT on 1 October 2016 ()
- Where
- 7 km (4 mi) north of Bailey, CO · earthquakes near Bailey
- Magnitude
- M 2.3 (ml)
- Depth
- 5.0 km below the surface
- Felt
- 32 reports · strongest reported intensity IV
- Nearest
- Jefferson County, 24 km ENE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3599 days ago
Earthquake alerts for Bailey, CO
Get a notification in this browser when USGS records an earthquake near Bailey, 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 19 km (12 mi) from the epicentre. In Bailey, 7 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: Upper Bear Creek, Evergreen, Kittredge, Indian Hills.
How big was it?
This earthquake released about 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
- Magna, Utah 2020 M 5.7 130,000× the energy of this one
- Around the size people start to feel M 3.0 11× the energy of this one
- This earthquake M 2.3 about 85 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 39.4664, -105.4867. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Jefferson County, CO | 24 km (15 mi) | ENE | earthquakes near Jefferson County |
| Clear Creek County, CO | 29 km (18 mi) | NNW | earthquakes near Clear Creek County |
| Park County, CO | 43 km (27 mi) | SSW | earthquakes near Park County |
| Gilpin County, CO | 44 km (27 mi) | N | earthquakes near Gilpin County |
| Douglas County, CO | 51 km (31 mi) | ESE | earthquakes near Douglas County |
| Summit County, CO | 58 km (36 mi) | WNW | earthquakes near Summit County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
1 earthquake has been recorded within 50 km since this one.
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.