Washington earthquakes

M2.0 earthquake 41 km W of Winthrop, Washington

A magnitude 2.0 earthquake struck 41 km W of Winthrop, Washington on Sun, Sep 27, 1987, 9:17 AM PDT (16:17 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M2.1 12 km SSE of Okanogan, Washington. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
2.0 (md), micro
Local time
UTC
1987-09-27 16:17:33 UTC
Depth
4.1 km (2.5 mi), shallow
Epicenter
48.414° N, 120.744° W
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 1.1 km horizontally, 0.7 km in depth
Magnitude uncertainty
±0.08
Depth from
From location
Station coverage gap
187°, poorly surrounded by stations
Stations used
10

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 9 in the 30 days before it.

After

  1. 2.112 km SSE of Okanogan, Washington · 14247 days ago · -1 km deep · 93 km away
  2. 2.129 km NNE of Winthrop, Washington · 14229 days ago · 0 km deep · 61 km away
  3. 1.56 km NW of Entiat, Washington · 14221 days ago · 0 km deep · 84 km away
  4. 1.632 km SE of Darrington, Washington · 14209 days ago · 14 km deep · 55 km away
  5. 2.055 km ESE of Darrington, Washington · 14209 days ago · 0 km deep · 31 km away
  6. 1.56 km ENE of Verlot, Washington · 14206 days ago · 14 km deep · 78 km away

Before

  1. 2.09 km SSW of Chelan Falls, Washington · 14248 days ago · 2 km deep · 92 km away
  2. 1.54 km N of Waterville, Washington · 14253 days ago · 2 km deep · 94 km away
  3. 1.75 km NNE of Entiat, Washington · 14259 days ago · -1 km deep · 88 km away
  4. 1.816 km SE of Glacier, Washington · 14261 days ago · 25 km deep · 87 km away
  5. 1.79 km NNW of Marblemount, Washington · 14264 days ago · 0 km deep · 61 km away
  6. 1.710 km NW of Marblemount, Washington · 14266 days ago · -1 km deep · 62 km away
  7. 1.736 km NE of Skykomish, Washington · 14272 days ago · 0 km deep · 56 km away
  8. 2.136 km NE of Skykomish, Washington · 14272 days ago · 0 km deep · 56 km away
  9. 1.96 km SSE of Concrete, Washington · 14276 days ago · 2 km deep · 72 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10226158. Read Wed, Sep 30, 2026, 9:58 AM UTC.