M1.6 earthquake 6 km N of Belfair, Washington
A magnitude 1.6 earthquake struck 6 km N of Belfair, Washington on Fri, Dec 20, 1991, 5:35 PM PST (01:35 UTC), 16 km (10 mi) below the surface.
A larger quake followed: M3.1 5 km WNW of Wauna, Washington. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.6 (Md, duration), micro
- Magnitude from
- Pacific Northwest Seismic Network
- Local time
- UTC
- 1991-12-21 01:35:32 UTC
- Depth
- 16.1 km (10.0 mi), shallow
- Epicenter
- 47.511° N, 122.825° 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 0.6 km horizontally, 0.7 km in depth
- Magnitude uncertainty
- ±0.07
- Depth from
- From location
- Station coverage gap
- 96°
- Stations used
- 20
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 5 in the 30 days before it.
After
- 1.57 km N of Belfair, Washington · 12704 days ago · 1 km deep · 1 km away
- 1.92 km WSW of Ames Lake, Washington · 12689 days ago · 6 km deep · 64 km away
- 1.53 km SSW of Snoqualmie, Washington · 12681 days ago · 17 km deep · 73 km away
- 3.15 km WNW of Wauna, Washington · 12676 days ago · 14 km deep · 15 km away
- 1.55 km NE of Snoqualmie, Washington · 12667 days ago · 9 km deep · 79 km away
- 1.92 km SE of Bryant, Washington · 12666 days ago · -1 km deep · 95 km away
- 1.910 km WNW of Belfair, Washington · 12654 days ago · 14 km deep · 10 km away
- 1.77 km WNW of Picnic Point, Washington · 12648 days ago · 26 km deep · 54 km away
- 2.76 km SSE of Quilcene, Washington · 12648 days ago · 15 km deep · 30 km away
Before
- 1.53 km NW of Silverdale, Washington · 12705 days ago · 47 km deep · 18 km away
- 1.94 km ESE of Belfair, Washington · 12707 days ago · 2 km deep · 9 km away
- 2.16 km W of Mineral, Washington · 12707 days ago · 14 km deep · 98 km away
- 1.52 km SSW of Mountlake Terrace, Washington · 12712 days ago · 22 km deep · 48 km away
- 2.42 km NE of Eastmont, Washington · 12729 days ago · 18 km deep · 67 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10287563. Read Fri, Oct 2, 2026, 9:04 AM UTC.