M2.8 earthquake 3 km SW of Hamilton, Washington
A magnitude 2.8 earthquake struck 3 km SW of Hamilton, Washington on Sun, Dec 15, 1974, 9:58 AM PST (17:58 UTC), 1 km (1 mi) below the surface.
A larger quake followed: M3.1 3 km SSW of Lyman, Washington. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.8 (md), micro
- Local time
- UTC
- 1974-12-15 17:58:07 UTC
- Depth
- 1.2 km (0.7 mi), shallow
- Epicenter
- 48.498° N, 122.023° 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 4.3 km horizontally, 33.2 km in depth
- Magnitude uncertainty
- ±0.16
- Depth from
- Operator assigned
- Station coverage gap
- 152°
- Stations used
- 10
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 5 in the 30 days before it.
After
- 3.13 km SSW of Lyman, Washington · 18909 days ago · 1 km deep · 4 km away
- 2.14 km SW of Hamilton, Washington · 18909 days ago · 0 km deep · 0 km away
- 2.52 km SW of Kenmore, Washington · 18888 days ago · 15 km deep · 86 km away
- 2.85 km WSW of Mount Vernon, Washington · 18886 days ago · 19 km deep · 30 km away
- 2.34 km S of Anacortes, Washington · 18878 days ago · 45 km deep · 43 km away
- 1.92 km NW of Redmond, Washington · 18861 days ago · 7 km deep · 91 km away
Before
- 1.84 km E of Big Lake, Washington · 18916 days ago · 19 km deep · 16 km away
- 1.80 km W of Fobes Hill, Washington · 18927 days ago · 9 km deep · 61 km away
- 1.94 km ESE of Cathcart, Washington · 18937 days ago · 16 km deep · 73 km away
- 1.511 km N of Quilcene, Washington · 18938 days ago · 23 km deep · 89 km away
- 1.51 km W of Monroe, Washington · 18939 days ago · -1 km deep · 72 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10860158. Read Tue, Sep 22, 2026, 12:11 PM UTC.