M1.8 earthquake 5 km ESE of Nooksack, Washington
A magnitude 1.8 earthquake struck 5 km ESE of Nooksack, Washington on Mon, Sep 10, 1973, 2:20 PM PDT (21:20 UTC), 15 km (10 mi) below the surface.
A larger quake followed: M2.4 5 km ESE of Nooksack, 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
- 1973-09-10 21:20:35 UTC
- Depth
- 15.4 km (9.6 mi), shallow
- Epicenter
- 48.902° N, 122.250° 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 2.5 km horizontally, 4.9 km in depth
- Magnitude uncertainty
- ±0.12
- Depth from
- From location
- Station coverage gap
- 237°, poorly surrounded by stations
- 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: 10 in the 60 days after this one and 4 in the 30 days before it.
After
- 2.45 km ESE of Nooksack, Washington · 19369 days ago · 21 km deep · 2 km away
- 1.98 km NW of Friday Harbor, Washington · 19369 days ago · 6 km deep · 70 km away
- 1.86 km NW of Friday Harbor, Washington · 19369 days ago · 5 km deep · 70 km away
- 1.55 km N of Marrowstone, Washington · 19367 days ago · 24 km deep · 94 km away
- 2.34 km SW of Geneva, Washington · 19364 days ago · 24 km deep · 25 km away
- 2.815 km NNE of Oak Bay, Canada · 19357 days ago · 50 km deep · 82 km away
- 1.78 km SE of Oak Bay, Canada · 19348 days ago · 22 km deep · 92 km away
- 1.64 km S of Lake Cavanaugh, Washington · 19336 days ago · 13 km deep · 71 km away
- 2.10 km SW of Oak Harbor, Washington · 19313 days ago · 16 km deep · 75 km away
- 1.95 km ESE of Alger, Washington · 19313 days ago · 14 km deep · 34 km away
Before
- 2.44 km NW of Swede Heaven, Washington · 19375 days ago · -1 km deep · 74 km away
- 2.15 km ESE of Port Townsend, Washington · 19376 days ago · 59 km deep · 94 km away
- 2.311 km SW of Concrete, Washington · 19377 days ago · 0 km deep · 58 km away
- 2.012 km SE of Hamilton, Washington · 19379 days ago · -1 km deep · 58 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10857013. Read Tue, Sep 22, 2026, 11:27 PM UTC.