M1.8 earthquake 38 km NNE of Amboy, Washington
A magnitude 1.8 earthquake struck 38 km NNE of Amboy, Washington on Tue, Jun 30, 1987, 4:59 PM PDT (23:59 UTC), -2 km (-1 mi) below the surface.
A larger quake followed: M1.9 23 km ENE 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
- 1987-06-30 23:59:56 UTC
- Depth
- -1.6 km (-1.0 mi), shallow
- Epicenter
- 46.206° N, 122.189° 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 0.3 km horizontally, 7.9 km in depth
- Magnitude uncertainty
- ±0.12
- Depth from
- Operator assigned
- Station coverage gap
- 117°
- Stations used
- 9
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 4 in the 30 days before it.
After
- 1.823 km ENE of Ashford, Washington · 14325 days ago · 2 km deep · 80 km away
- 1.923 km ENE of Ashford, Washington · 14317 days ago · -1 km deep · 79 km away
- 1.917 km ENE of Packwood, Washington · 14312 days ago · 8 km deep · 76 km away
- 1.712 km S of Morton, Washington · 14308 days ago · 6 km deep · 27 km away
- 1.625 km ENE of Ashford, Washington · 14304 days ago · 0 km deep · 81 km away
- 1.635 km NNE of Amboy, Washington · 14288 days ago · -2 km deep · 3 km away
Before
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10223238. Read Tue, Sep 22, 2026, 9:39 PM UTC.