Washington earthquakes

M1.9 earthquake 7 km S of Morton, Washington

A magnitude 1.9 earthquake struck 7 km S of Morton, Washington on Sun, Dec 27, 1987, 9:23 AM PST (17:23 UTC), 15 km (9 mi) below the surface.

A larger quake followed: M2.7 3 km WSW of Crocker, 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
1.9 (md), micro
Local time
UTC
1987-12-27 17:23:39 UTC
Depth
14.8 km (9.2 mi), shallow
Epicenter
46.490° N, 122.273° 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 0.3 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.05
Depth from
From location
Station coverage gap
46°
Stations used
34

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 13 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 1.52 km NE of North Bonneville, Washington · 14139 days ago · 2 km deep · 96 km away
  2. 2.73 km WSW of Crocker, Washington · 14137 days ago · -1 km deep · 65 km away
  3. 2.24 km SE of Orting, Washington · 14137 days ago · 6 km deep · 65 km away
  4. 2.03 km SW of Crocker, Washington · 14137 days ago · 0 km deep · 64 km away
  5. 2.03 km NE of North Bonneville, Washington · 14136 days ago · 3 km deep · 96 km away
  6. 2.24 km SE of Orting, Washington · 14135 days ago · 5 km deep · 65 km away
  7. 2.723 km ENE of Ashford, Washington · 14130 days ago · 1 km deep · 56 km away
  8. 1.922 km ENE of Ashford, Washington · 14130 days ago · 0 km deep · 56 km away
  9. 1.510 km NE of Ashford, Washington · 14124 days ago · 10 km deep · 46 km away
  10. 1.620 km S of Morton, Washington · 14121 days ago · 9 km deep · 13 km away
  11. 1.62 km NNE of North Bonneville, Washington · 14119 days ago · -1 km deep · 95 km away
  12. 1.61 km NE of North Bonneville, Washington · 14117 days ago · 1 km deep · 97 km away
  13. 1.810 km E of Ashford, Washington · 14095 days ago · 7 km deep · 42 km away

Before

  1. 2.621 km S of Morton, Washington · 14178 days ago · 7 km deep · 14 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10230028. Read Tue, Sep 22, 2026, 5:28 PM UTC.