M1.7 earthquake 18 km N of Winthrop, Washington
A magnitude 1.7 earthquake struck 18 km N of Winthrop, Washington on Fri, May 17, 1985, 1:28 PM PDT (20:28 UTC), -1 km (0 mi) below the surface.
A larger quake followed: M2.2 16 km SE of Okanogan, 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), micro
- Local time
- UTC
- 1985-05-17 20:28:03 UTC
- Depth
- -0.8 km (-0.5 mi), shallow
- Epicenter
- 48.644° N, 120.196° 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 1.3 km horizontally, 6.2 km in depth
- Magnitude uncertainty
- ±0.15
- Depth from
- Operator assigned
- Station coverage gap
- 222°, poorly surrounded by stations
- 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: 2 in the 60 days after this one and 4 in the 30 days before it.
After
- 1.52 km NNE of Chelan Falls, Washington · 15100 days ago · -1 km deep · 93 km away
- 2.216 km SE of Okanogan, Washington · 15096 days ago · 5 km deep · 71 km away
Before
- 1.515 km SW of Disautel, Washington · 15113 days ago · 0 km deep · 71 km away
- 2.429 km W of Malo, Washington · 15113 days ago · 26 km deep · 91 km away
- 2.022 km ESE of Malott, Washington · 15120 days ago · 0 km deep · 76 km away
- 2.426 km NNE of Winthrop, Washington · 15130 days ago · 2 km deep · 11 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10189738. Read Tue, Sep 22, 2026, 2:46 PM UTC.