M3.9 earthquake 4 km SE of Pateros, Washington
A magnitude 3.9 earthquake struck 4 km SE of Pateros, Washington on Sun, Apr 14, 1991, 10:31 PM PDT (05:31 UTC), 11 km (7 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.9 (Md, duration), minor
- Magnitude from
- Pacific Northwest Seismic Network
- Local time
- UTC
- 1991-04-15 05:31:13 UTC
- Depth
- 11.3 km (7.0 mi), shallow
- Epicenter
- 48.027° N, 119.863° W
- Region
- Washington
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 3.9 | Md, duration | Pacific Northwest Seismic Network | Preferred · Final · ±0.01 · 22 stations |
| 3.0 | mb, body-wave | USGS National Earthquake Information Center | Reviewed · 1 stations |
What happened
The USGS’s account of the effects of this earthquake.
Felt (V) at Chelan and Methow; (IV) at Brewster, Bridgeport, Malott and Pateros; (III) at Okanogan, Omak, Twisp and Waterville. Also felt at Grand Coulee.
From the USGS event page for uw10273473. 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.
- Location uncertainty
- About 0.1 km horizontally, 0.1 km in depth
- Magnitude uncertainty
- ±0.01
- Depth from
- Operator assigned
- Station coverage gap
- 167°
- Stations used
- 14
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 3 in the 30 days before it.
After
- 1.515 km ENE of Twisp, Washington · 12953 days ago · 0 km deep · 45 km away
- 1.912 km S of Leavenworth, Washington · 12953 days ago · -1 km deep · 85 km away
- 3.155 km WNW of Granite Falls, Washington · 12943 days ago · -1 km deep · 76 km away
- 1.87 km NNE of Entiat, Washington · 12941 days ago · 0 km deep · 40 km away
- 2.456 km WNW of Granite Falls, Washington · 12936 days ago · 5 km deep · 75 km away
- 1.97 km NW of Wilbur, Washington · 12901 days ago · 6 km deep · 85 km away
Before
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10273473 (also filed as usp0004qbw). Read Fri, Oct 2, 2026, 3:20 AM UTC.