M1.6 earthquake 8 km SSE of Cliffdell, Washington
A magnitude 1.6 earthquake struck 8 km SSE of Cliffdell, Washington on Fri, Apr 21, 1978, 11:41 PM PST (07:41 UTC), 2 km (2 mi) below the surface.
A larger quake followed: M2.6 6 km NNW of Nile, 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
- 1978-04-22 07:41:58 UTC
- Depth
- 2.5 km (1.6 mi), shallow
- Epicenter
- 46.880° N, 121.016° 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 5.5 km horizontally, 15.4 km in depth
- Magnitude uncertainty
- ±0.08
- Depth from
- Operator assigned
- Station coverage gap
- 212°, poorly surrounded by stations
- Stations used
- 10
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 2.66 km NNW of Nile, Washington · 17635 days ago · 1 km deep · 3 km away
- 2.27 km SE of Cliffdell, Washington · 17634 days ago · -1 km deep · 2 km away
Before
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10846618. Read Tue, Sep 22, 2026, 6:06 AM UTC.