M1.8 earthquake 5 km SSE of Mossyrock, Washington
A magnitude 1.8 earthquake struck 5 km SSE of Mossyrock, Washington on Thu, Dec 6, 1973, 10:46 AM PST (18:46 UTC), 8 km (5 mi) below the surface.
A larger quake followed: M2.8 12 km NE of Ashford, 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
- 1973-12-06 18:46:32 UTC
- Depth
- 7.9 km (4.9 mi), shallow
- Epicenter
- 46.485° N, 122.447° 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 3.8 km horizontally, 0.1 km in depth
- Magnitude uncertainty
- ±0.13
- Depth from
- From location
- Station coverage gap
- 162°
- Stations used
- 5
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
- 1.839 km SSE of Morton, Washington · 19279 days ago · 10 km deep · 38 km away
- 2.812 km NE of Ashford, Washington · 19278 days ago · 8 km deep · 56 km away
- 2.518 km E of Packwood, Washington · 19267 days ago · 3 km deep · 79 km away
- 2.110 km NE of Ashford, Washington · 19257 days ago · 11 km deep · 55 km away
- 1.72 km NW of Lakeland South, Washington · 19256 days ago · 16 km deep · 91 km away
- 1.91 km W of La Grande, Washington · 19232 days ago · 5 km deep · 40 km away
Before
- 2.415 km NE of Ashford, Washington · 19284 days ago · 4 km deep · 59 km away
- 1.925 km ENE of Packwood, Washington · 19286 days ago · 4 km deep · 86 km away
- 1.61 km WNW of Auburn, Washington · 19293 days ago · 3 km deep · 93 km away
- 1.81 km ESE of Dash Point, Washington · 19297 days ago · 3 km deep · 92 km away
- 1.83 km NW of Home, Washington · 19298 days ago · 42 km deep · 94 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10840268. Read Tue, Sep 22, 2026, 8:51 AM UTC.