Washington earthquakes

M1.8 earthquake 22 km S of Morton, Washington

A magnitude 1.8 earthquake struck 22 km S of Morton, Washington on Fri, Sep 11, 1987, 5:48 AM PDT (12:48 UTC), 12 km (7 mi) below the surface.

A larger quake followed: M2.8 22 km S of Morton, Washington. This one was a foreshock.

Morton forecastMore in Washington

Map

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

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The earthquake

Magnitude
1.8 (md), micro
Local time
UTC
1987-09-11 12:48:58 UTC
Depth
11.8 km (7.3 mi), shallow
Epicenter
46.353° N, 122.254° 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 0.4 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.05
Depth from
From location
Station coverage gap
37°
Stations used
33

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 1.722 km S of Morton, Washington · 14263 days ago · 11 km deep · 1 km away
  2. 2.822 km S of Morton, Washington · 14263 days ago · 11 km deep · 0 km away
  3. 1.622 km S of Morton, Washington · 14263 days ago · 12 km deep · 0 km away
  4. 2.616 km WSW of Alder, Washington · 14261 days ago · 18 km deep · 44 km away
  5. 1.53 km W of Deer Island, Oregon · 14259 days ago · 23 km deep · 68 km away
  6. 1.930 km E of Packwood, Washington · 14250 days ago · -1 km deep · 80 km away
  7. 1.715 km E of Castle Rock, Washington · 14246 days ago · 6 km deep · 35 km away
  8. 2.62 km W of Brush Prairie, Washington · 14243 days ago · 18 km deep · 73 km away
  9. 2.021 km SSE of Mossyrock, Washington · 14230 days ago · 7 km deep · 12 km away
  10. 2.025 km ENE of Ashford, Washington · 14226 days ago · -1 km deep · 70 km away

Before

  1. 2.123 km ENE of Ashford, Washington · 14271 days ago · 1 km deep · 68 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10223228. Read Tue, Sep 29, 2026, 10:15 PM UTC.