M1.8 earthquake 4 km E of Brinnon, Washington
A magnitude 1.8 earthquake struck 4 km E of Brinnon, Washington on Wed, Feb 18, 1987, 3:55 PM PST (23:55 UTC), 14 km (9 mi) below the surface.
A larger quake followed: M2.3 3 km S of Seattle, 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
- 1987-02-18 23:55:52 UTC
- Depth
- 14.3 km (8.9 mi), shallow
- Epicenter
- 47.682° N, 122.844° 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 1.1 km horizontally, 1.8 km in depth
- Magnitude uncertainty
- ±0.08
- Depth from
- Operator assigned
- Station coverage gap
- 35°
- Stations used
- 26
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 1 in the 30 days before it.
After
- 2.33 km S of Seattle, Washington · 14440 days ago · 12 km deep · 40 km away
- 1.61 km SSW of Mercer Island, Washington · 14439 days ago · 5 km deep · 48 km away
- 1.50 km SSW of Echo Lake, Washington · 14433 days ago · 21 km deep · 60 km away
- 2.27 km ENE of Lofall, Washington · 14422 days ago · 8 km deep · 27 km away
- 2.61 km NE of Riverton, Washington · 14413 days ago · 25 km deep · 47 km away
- 1.78 km NNE of Snoqualmie, Washington · 14412 days ago · 8 km deep · 81 km away
- 1.61 km NE of Riverton, Washington · 14410 days ago · 24 km deep · 47 km away
- 2.51 km NE of Riverton, Washington · 14405 days ago · 23 km deep · 47 km away
Before
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10216413. Read Tue, Sep 22, 2026, 7:42 AM UTC.