M4.8 earthquake 26 km W of Brinnon, Washington
A magnitude 4.8 earthquake struck 26 km W of Brinnon, Washington on Fri, Apr 25, 2003, 3:02 AM PDT (10:02 UTC), 51 km (31 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.8 (Md, duration), light
- Magnitude from
- Pacific Northwest Seismic Network
- Local time
- UTC
- 2003-04-25 10:02:12 UTC
- Depth
- 50.5 km (31.4 mi), shallow
- Epicenter
- 47.670° N, 123.250° W
- Region
- Washington
- Felt reports
- 673
- Strongest shaking
- III, weak shaking
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 4.8 | Md, duration | Pacific Northwest Seismic Network | Preferred · Final · ±0.04 · 8 stations |
| 4.6 | Mw, moment | USGS National Earthquake Information Center | Reviewed |
What happened
The USGS’s account of the effects of this earthquake.
Felt (III) at Belfair, Bremerton, Olympia, Port Angeles, Port Orchard, Poulsbo, Seattle, Sequim, Silverdale, Renton and Tacoma. Also felt at Vancouver and on southern Vancouver Island, British Columbia, Canada.
From the USGS event page for uw10583988. U.S. Geological Survey text and figures are in the public domain.
Shaking
The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.
- Strongest estimated
- III, weak shaking
- Map
- Automatic
Did you feel it?
673 people reported to the USGS what they felt; the strongest reported shaking was V, moderate shaking.
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 0.3 km horizontally, 0.6 km in depth
- Magnitude uncertainty
- ±0.04
- Depth from
- From location
- Station coverage gap
- 53°
- Stations used
- 85
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.8 and up: 7 in the 60 days after this one and 5 in the 30 days before it.
After
- 2.925 km W of Brinnon, Washington · 8560 days ago · 49 km deep · 1 km away
- 1.80 km WSW of Bellevue, Washington · 8546 days ago · 29 km deep · 78 km away
- 1.83 km S of Skokomish, Washington · 8546 days ago · 45 km deep · 42 km away
- 3.74 km SSW of Gorst, Washington · 8525 days ago · 25 km deep · 44 km away · felt by 1,560
- 1.85 km WSW of Seattle, Washington · 8521 days ago · 26 km deep · 65 km away
- 3.52 km NNW of Ames Lake, Washington · 8504 days ago · 20 km deep · 95 km away · felt by 579
- 2.5Puget Sound region, Washington · 8504 days ago · 32 km deep · 81 km away
Before
- 1.85 km SW of Gorst, Washington · 8567 days ago · 21 km deep · 43 km away
- 2.72 km NE of Redmond, Washington · 8568 days ago · 14 km deep · 86 km away
- 1.92 km NW of Eastmont, Washington · 8569 days ago · 21 km deep · 82 km away
- 2.11 km NE of Keyport, Washington · 8570 days ago · 24 km deep · 48 km away
- 2.18 km ENE of Queets, Washington · 8587 days ago · 26 km deep · 74 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10583988 (also filed as usp000bvxx, uw04251002). Read Thu, Oct 1, 2026, 7:24 AM UTC.