M1.8 earthquake 13 km NNE of Concrete, Washington
A magnitude 1.8 earthquake struck 13 km NNE of Concrete, Washington on Sun, Nov 11, 1973, 11:01 AM PST (19:01 UTC), -1 km (-1 mi) below the surface.
A larger quake followed: M2.4 10 km ESE of Deming, 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
- 1973-11-11 19:01:57 UTC
- Depth
- -1.2 km (-0.8 mi), shallow
- Epicenter
- 48.656° N, 121.682° 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 0.9 km horizontally, 1.4 km in depth
- Magnitude uncertainty
- ±0.12
- Depth from
- Operator assigned
- Station coverage gap
- 232°, poorly surrounded by stations
- Stations used
- 3
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
- 1.610 km NNW of Anacortes, Washington · 19305 days ago · 13 km deep · 71 km away
- 2.410 km ESE of Deming, Washington · 19299 days ago · 3 km deep · 34 km away
- 1.87 km SW of Sultan, Washington · 19289 days ago · 8 km deep · 96 km away
- 1.93 km SSW of Clinton, Washington · 19275 days ago · 23 km deep · 94 km away
- 1.75 km NNE of Startup, Washington · 19254 days ago · 7 km deep · 83 km away
Before
- 2.02 km SSE of Coupeville, Washington · 19309 days ago · 32 km deep · 89 km away
- 1.95 km ESE of Alger, Washington · 19312 days ago · 14 km deep · 44 km away
- 2.10 km SW of Oak Harbor, Washington · 19312 days ago · 16 km deep · 82 km away
- 1.64 km S of Lake Cavanaugh, Washington · 19336 days ago · 13 km deep · 48 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10857743. Read Tue, Sep 22, 2026, 9:37 AM UTC.