M1.8 earthquake 10 km NNW of Mansfield, Washington
A magnitude 1.8 earthquake struck 10 km NNW of Mansfield, Washington on Sat, Apr 21, 1979, 4:18 AM PST (12:18 UTC), 3 km (2 mi) below the surface.
A larger quake followed: M2.4 6 km WNW of Entiat, Washington. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.8 (md), micro
- Local time
- UTC
- 1979-04-21 12:18:15 UTC
- Depth
- 3.1 km (1.9 mi), shallow
- Epicenter
- 47.901° N, 119.677° 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 0.4 km horizontally, 2.3 km in depth
- Magnitude uncertainty
- ±0.06
- Depth from
- From location
- Station coverage gap
- 118°
- Stations used
- 6
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 4 in the 30 days before it.
After
- 1.9Washington · 17327 days ago · 0 km deep · 58 km away
- 1.6Washington · 17319 days ago · 6 km deep · 55 km away
- 1.78 km NNE of Waterville, Washington · 17310 days ago · 5 km deep · 34 km away
- 2.46 km WNW of Entiat, Washington · 17301 days ago · 7 km deep · 50 km away
- 1.840 km NE of Skykomish, Washington · 17278 days ago · 9 km deep · 96 km away
Before
- 2.09 km NNW of Mansfield, Washington · 17336 days ago · 5 km deep · 1 km away
- 2.012 km ENE of Conconully, Washington · 17343 days ago · 17 km deep · 78 km away
- 1.77 km E of Conconully, Washington · 17343 days ago · 9 km deep · 74 km away
- 1.717 km ENE of Leavenworth, Washington · 17350 days ago · 0 km deep · 63 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10849578. Read Wed, Sep 30, 2026, 6:43 PM UTC.