Colorado earthquakes

M4.1 earthquake Colorado

A magnitude 4.1 earthquake struck in Colorado on Mon, Jun 19, 2023, 8:18 AM MDT (14:18 UTC), 6 km (4 mi) below the surface.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 4.1 (mwr), light
Local time: Mon, Jun 19, 2023, 8:18 AM MDT
UTC: 2023-06-19 14:18:55 UTC
Depth: 6.0 km (3.7 mi), shallow
Epicenter: 37.312° N, 104.479° W
Region: Colorado
Felt reports: 56
Strongest shaking: V, moderate shaking
PAGER alert: Green
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: V, moderate shaking
Peak ground acceleration: 10.7% of gravity
Peak ground velocity: 2.5 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

56 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

Did You Feel It? map: shaking reported by the public — Shaking reported by the public, by area. Map: USGS Did You Feel It?

Estimated impact

The USGS PAGER system estimates deaths and economic losses from the shaking and the population and buildings exposed to it.

Alert level: Green: little or no damage or loss of life expected

Deaths: estimated chance of each range
Range	Chance
Under 1	65%
1 to 10	30%
10 to 100	4%
100 to 1,000	Under 1%
1,000 to 10,000	Under 1%
10,000 to 100,000	Under 1%
100,000 to 10,000,000	Under 1%

Economic losses: estimated chance of each range
Range, million USD	Chance
Under 1	65%
1 to 10	30%
10 to 100	4%
100 to 1,000	Under 1%
1,000 to 10,000	Under 1%
10,000 to 100,000	Under 1%
100,000 to 10,000,000	Under 1%

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Normal
Moment magnitude: 4.1 Mwr
Nodal plane 1: Strike 312°, dip 49°, rake -86°
Nodal plane 2: Strike 126°, dip 41°, rake -95°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 1.5 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.04
Depth from: From moment tensor inversion
Station coverage gap: 46°
Stations used: 59

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 39 in the 60 days after this one and 20 in the 30 days before it.

After

Before

Earthquakes today Colorado earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000k9kq. Read Tue, Sep 22, 2026, 10:01 AM UTC.