M1.8 earthquake 27 km NNE of Amboy, Washington
A magnitude 1.8 earthquake struck 27 km NNE of Amboy, Washington on Fri, Aug 31, 1973, 3:58 PM PDT (22:58 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M2.4 38 km NNE of Amboy, 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
- 1973-08-31 22:58:18 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 46.150° N, 122.367° 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 0.9 km horizontally, 1.1 km in depth
- Magnitude uncertainty
- ±0.13
- Depth from
- From location
- Station coverage gap
- 262°, poorly surrounded by stations
- Stations used
- 4
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 3 in the 30 days before it.
After
- 2.438 km NNE of Amboy, Washington · 19382 days ago · 8 km deep · 15 km away
- 1.910 km NNW of Packwood, Washington · 19378 days ago · 2 km deep · 77 km away
- 1.99 km SSE of Mossyrock, Washington · 19376 days ago · 9 km deep · 34 km away
- 2.212 km SSE of Mossyrock, Washington · 19373 days ago · 11 km deep · 31 km away
- 2.214 km NNE of Ashford, Washington · 19363 days ago · 7 km deep · 87 km away
- 1.616 km ESE of Ashford, Washington · 19354 days ago · 11 km deep · 74 km away
- 1.734 km SSE of Morton, Washington · 19334 days ago · 6 km deep · 27 km away
Before
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10856853. Read Tue, Sep 29, 2026, 10:57 AM UTC.