M3.0 earthquake Colorado

A magnitude 3.0 earthquake struck in Colorado on Thu, Aug 17, 2023, 11:20 AM MDT (17:20 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M4.0 19 km SSW of Weston, Colorado. This one was a foreshock.

Map

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

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

4 people reported to the USGS what they felt; the strongest reported shaking was V, moderate shaking.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 65 in the 60 days after this one and 23 in the 30 days before it.

The first 60 of 65.

From the USGS Earthquake Hazards Program and its partner networks, event us7000kp2k. Read Tue, Sep 29, 2026, 5:43 PM UTC.