M2.5 earthquake 15 km WNW of Pomeroy, Washington
A magnitude 2.5 earthquake struck 15 km WNW of Pomeroy, Washington on Mon, Sep 23, 1985, 1:00 PM PDT (20:00 UTC), 0 km (0 mi) below the surface.
A larger quake followed: M2.5 15 km ENE of Princeton, Idaho. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.5 (md), micro
- Local time
- UTC
- 1985-09-23 20:00:19 UTC
- Depth
- -0.3 km (-0.2 mi), shallow
- Epicenter
- 46.535° N, 117.785° W
- Region
- Washington
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 0.7 km horizontally, 3.4 km in depth
- Magnitude uncertainty
- ±0.13
- Depth from
- Operator assigned
- Station coverage gap
- 199°, poorly surrounded by stations
- Stations used
- 16
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10195723. Read Tue, Sep 22, 2026, 1:24 AM UTC.