M1.8 earthquake 22 km ENE of Mansfield, Washington
A magnitude 1.8 earthquake struck 22 km ENE of Mansfield, Washington on Wed, Jul 22, 1987, 1:32 PM PDT (20:32 UTC), 8 km (5 mi) below the surface.
A larger quake followed: M1.9 9 km WSW of Tonasket, 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
- 1987-07-22 20:32:06 UTC
- Depth
- 7.7 km (4.8 mi), shallow
- Epicenter
- 47.887° N, 119.363° 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 2.6 km horizontally, 6.7 km in depth
- Magnitude uncertainty
- ±0.12
- Depth from
- Operator assigned
- Station coverage gap
- 119°
- Stations used
- 11
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 0 in the 30 days before it.
After
- 1.52 km SE of Entiat, Washington · 14304 days ago · 3 km deep · 66 km away
- 1.99 km WSW of Tonasket, Washington · 14292 days ago · 9 km deep · 87 km away
- 2.24 km SW of Entiat, Washington · 14290 days ago · -1 km deep · 71 km away
- 2.010 km WNW of Entiat, Washington · 14281 days ago · -1 km deep · 74 km away
- 2.27 km SSE of Okanogan, Washington · 14271 days ago · 0 km deep · 48 km away
- 1.75 km NNE of Entiat, Washington · 14251 days ago · -1 km deep · 63 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10222378. Read Tue, Sep 22, 2026, 3:36 PM UTC.