M2.0 earthquake 43 km WNW of Winthrop, Washington
A magnitude 2.0 earthquake struck 43 km WNW of Winthrop, Washington on Tue, Dec 18, 1984, 4:42 PM PST (00:42 UTC), -1 km (0 mi) below the surface.
A larger quake followed: M2.9 7 km NW of Concrete, Washington. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.0 (md), micro
- Local time
- UTC
- 1984-12-19 00:42:02 UTC
- Depth
- -0.8 km (-0.5 mi), shallow
- Epicenter
- 48.692° N, 120.675° 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, 9.6 km in depth
- Magnitude uncertainty
- ±0.10
- Depth from
- Operator assigned
- Station coverage gap
- 189°, poorly surrounded by stations
- Stations used
- 17
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 5 in the 30 days before it.
After
- 1.66 km NNW of Concrete, Washington · 15252 days ago · 4 km deep · 83 km away
- 1.75 km N of Hamilton, Washington · 15252 days ago · 13 km deep · 97 km away
- 2.97 km NW of Concrete, Washington · 15248 days ago · 2 km deep · 84 km away
- 2.17 km NW of Concrete, Washington · 15240 days ago · 1 km deep · 85 km away
- 1.97 km NW of Concrete, Washington · 15238 days ago · 1 km deep · 84 km away
Before
- 1.65 km NNW of Concrete, Washington · 15256 days ago · 3 km deep · 82 km away
- 1.96 km NW of Concrete, Washington · 15260 days ago · 1 km deep · 84 km away
- 3.27 km NW of Concrete, Washington · 15268 days ago · -1 km deep · 84 km away
- 3.17 km NW of Concrete, Washington · 15269 days ago · -1 km deep · 84 km away
- 2.31 km ENE of Hamilton, Washington · 15281 days ago · -1 km deep · 97 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10183268. Read Tue, Sep 22, 2026, 10:50 AM UTC.