M3.5 earthquake 16 km ESE of Richland, Oregon
A magnitude 3.5 earthquake struck 16 km ESE of Richland, Oregon on Mon, Sep 28, 1981, 11:39 PM MDT (05:39 UTC), 5 km (3 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.5 (ML, local (Richter)), minor
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1981-09-29 05:39:48 UTC
- Depth
- 5.0 km (3.1 mi), shallow
- Epicenter
- 44.693° N, 116.993° W
- Region
- Idaho
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
What happened
The USGS’s account of the effects of this earthquake.
FELT (IV) AT CAMBRIDGE.
From the USGS event page for usp0001g5w. U.S. Geological Survey text and figures are in the public domain.
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Depth from
- OPERATOR_ASSIGNED
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 0 in the 60 days after this one and 0 in the 30 days before it.
None recorded.
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0001g5w. Read Thu, Oct 1, 2026, 4:31 AM UTC.