M1.6 earthquake 35 km NNE of Amboy, Washington
A magnitude 1.6 earthquake struck 35 km NNE of Amboy, Washington on Tue, Aug 11, 1987, 12:23 AM PDT (07:23 UTC), -2 km (-1 mi) below the surface.
A larger quake followed: M2.8 22 km S of Morton, 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
- 1987-08-11 07:23:52 UTC
- Depth
- -1.7 km (-1.1 mi), shallow
- Epicenter
- 46.184° N, 122.201° 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 0.1 km horizontally, 2.9 km in depth
- Magnitude uncertainty
- ±0.10
- Depth from
- Operator assigned
- Station coverage gap
- 138°
- 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: 11 in the 60 days after this one and 4 in the 30 days before it.
After
- 2.123 km ENE of Ashford, Washington · 14276 days ago · 1 km deep · 82 km away
- 1.822 km S of Morton, Washington · 14269 days ago · 12 km deep · 19 km away
- 1.722 km S of Morton, Washington · 14269 days ago · 11 km deep · 20 km away
- 2.822 km S of Morton, Washington · 14269 days ago · 11 km deep · 19 km away
- 1.622 km S of Morton, Washington · 14268 days ago · 12 km deep · 19 km away
- 2.616 km WSW of Alder, Washington · 14266 days ago · 18 km deep · 63 km away
- 1.53 km W of Deer Island, Oregon · 14265 days ago · 23 km deep · 60 km away
- 1.53 km NNW of Mount Hood Village, Oregon · 14256 days ago · -1 km deep · 91 km away
- 1.930 km E of Packwood, Washington · 14256 days ago · -1 km deep · 85 km away
- 1.715 km E of Castle Rock, Washington · 14251 days ago · 6 km deep · 40 km away
- 2.62 km W of Brush Prairie, Washington · 14248 days ago · 18 km deep · 58 km away
Before
- 1.625 km ENE of Ashford, Washington · 14317 days ago · 0 km deep · 83 km away
- 1.712 km S of Morton, Washington · 14321 days ago · 6 km deep · 29 km away
- 1.917 km ENE of Packwood, Washington · 14324 days ago · 8 km deep · 78 km away
- 1.923 km ENE of Ashford, Washington · 14329 days ago · -1 km deep · 81 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10222198. Read Mon, Oct 5, 2026, 6:18 AM UTC.