M3.5 earthquake 1 km WSW of Arvada, Colorado
A magnitude 3.5 earthquake struck 1 km WSW of Arvada, Colorado on Wed, Sep 29, 1965, 12:59 PM GMT-6 (18:59 UTC), 5 km (3 mi) below the surface.
A larger quake followed: M3.8 8 km NNE of Aurora, Colorado. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.5 (ml), minor
- Local time
- UTC
- 1965-09-29 18:59:56 UTC
- Depth
- 5.0 km (3.1 mi), shallow
- Epicenter
- 39.800° N, 105.100° W
- Region
- Colorado
- Strongest shaking
- V, moderate shaking
- 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
- Map
- Automatic
Did you feel it?
No one has reported feeling this quake to the USGS.
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 1 in the 60 days after this one and 1 in the 30 days before it.
After
Before
Earthquakes todayColorado earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event ushis2854 (also filed as atlas19650929185956). Read Tue, Sep 22, 2026, 12:16 PM UTC.