M1.6 earthquake 11 km ENE of Onalaska, Washington
A magnitude 1.6 earthquake struck 11 km ENE of Onalaska, Washington on Fri, Aug 4, 1978, 4:58 AM PDT (11:58 UTC), 17 km (11 mi) below the surface.
A larger quake followed: M1.9 6 km W of Burley, Washington. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.6 (md), micro
- Local time
- UTC
- 1978-08-04 11:58:50 UTC
- Depth
- 17.4 km (10.8 mi), shallow
- Epicenter
- 46.630° N, 122.590° 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 0.6 km horizontally, 1.0 km in depth
- Magnitude uncertainty
- ±0.09
- Depth from
- From location
- Station coverage gap
- 172°
- Stations used
- 9
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 4 in the 30 days before it.
After
- 1.65 km W of Burley, Washington · 17573 days ago · 22 km deep · 89 km away
- 1.96 km W of Burley, Washington · 17548 days ago · 22 km deep · 89 km away
- 2.11 km NW of Federal Way, Washington · 17539 days ago · 14 km deep · 81 km away
Before
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10847618. Read Tue, Sep 22, 2026, 5:56 AM UTC.