M2.1 earthquake 12 km SSE of Okanogan, Washington
A magnitude 2.1 earthquake struck 12 km SSE of Okanogan, Washington on Mon, Sep 28, 1987, 10:16 AM PDT (17:16 UTC), -1 km (-1 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.1 (md), micro
- Local time
- UTC
- 1987-09-28 17:16:50 UTC
- Depth
- -1.0 km (-0.6 mi), shallow
- Epicenter
- 48.259° N, 119.511° 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 0.5 km horizontally, 0.7 km in depth
- Magnitude uncertainty
- ±0.12
- Depth from
- Operator assigned
- Station coverage gap
- 195°, poorly surrounded by stations
- Stations used
- 13
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 4 in the 30 days before it.
After
- 2.129 km NNE of Winthrop, Washington · 14221 days ago · 0 km deep · 66 km away
- 1.917 km E of Mansfield, Washington · 14220 days ago · -1 km deep · 51 km away
- 1.56 km NW of Entiat, Washington · 14213 days ago · 0 km deep · 82 km away
- 1.615 km NE of Marlin, Washington · 14181 days ago · 0 km deep · 98 km away
Before
- 2.041 km W of Winthrop, Washington · 14240 days ago · 4 km deep · 93 km away
- 2.09 km SSW of Chelan Falls, Washington · 14240 days ago · 2 km deep · 71 km away
- 1.54 km N of Waterville, Washington · 14245 days ago · 2 km deep · 76 km away
- 1.75 km NNE of Entiat, Washington · 14251 days ago · -1 km deep · 77 km away
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10226278. Read Tue, Sep 22, 2026, 8:57 AM UTC.