M1.7 earthquake 15 km SE of Ashford, Washington
A magnitude 1.7 earthquake struck 15 km SE of Ashford, Washington on Thu, Mar 26, 1987, 6:43 AM PST (14:43 UTC), 7 km (4 mi) below the surface.
A larger quake followed: M2.6 1 km NE of Riverton, Washington. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.7 (Md, duration), micro
- Magnitude from
- Pacific Northwest Seismic Network
- Local time
- UTC
- 1987-03-26 14:43:24 UTC
- Depth
- 6.6 km (4.1 mi), shallow
- Epicenter
- 46.668° N, 121.882° 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, 0.4 km in depth
- Magnitude uncertainty
- ±0.07
- Depth from
- From location
- Station coverage gap
- 50°
- Stations used
- 26
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 4 in the 30 days before it.
After
- 2.61 km NE of Riverton, Washington · 14423 days ago · 25 km deep · 97 km away
- 1.61 km NE of Riverton, Washington · 14421 days ago · 24 km deep · 97 km away
- 2.51 km NE of Riverton, Washington · 14415 days ago · 23 km deep · 97 km away
- 1.619 km N of Packwood, Washington · 14409 days ago · 6 km deep · 23 km away
- 2.11 km E of Algona, Washington · 14388 days ago · 12 km deep · 73 km away
- 1.77 km ENE of Mossyrock, Washington · 14379 days ago · 22 km deep · 41 km away
- 2.210 km E of Yacolt, Washington · 14376 days ago · 6 km deep · 94 km away
Before
- 1.910 km NNW of Klickitat, Washington · 14437 days ago · 5 km deep · 99 km away
- 1.528 km SW of White Swan, Washington · 14438 days ago · -1 km deep · 85 km away
- 1.924 km ENE of Yacolt, Washington · 14446 days ago · 3 km deep · 83 km away
- 2.04 km SSW of Morton, Washington · 14464 days ago · 16 km deep · 36 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10218648. Read Fri, Oct 2, 2026, 7:47 PM UTC.