Washington earthquakes

M1.9 earthquake 21 km S of Morton, Washington

A magnitude 1.9 earthquake struck 21 km S of Morton, Washington on Fri, Nov 27, 1987, 4:02 AM PST (12:02 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M2.6 21 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
1.9 (md), micro
Local time
UTC
1987-11-27 12:02:42 UTC
Depth
9.6 km (5.9 mi), shallow
Epicenter
46.369° N, 122.252° 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, 0.3 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
49°
Stations used
29

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 12 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 2.621 km S of Morton, Washington · 14177 days ago · 7 km deep · 1 km away
  2. 1.97 km S of Morton, Washington · 14149 days ago · 15 km deep · 14 km away
  3. 1.52 km NE of North Bonneville, Washington · 14139 days ago · 2 km deep · 83 km away
  4. 2.73 km WSW of Crocker, Washington · 14137 days ago · -1 km deep · 78 km away
  5. 2.24 km SE of Orting, Washington · 14136 days ago · 6 km deep · 78 km away
  6. 2.03 km SW of Crocker, Washington · 14136 days ago · 0 km deep · 77 km away
  7. 2.03 km NE of North Bonneville, Washington · 14136 days ago · 3 km deep · 83 km away
  8. 2.24 km SE of Orting, Washington · 14134 days ago · 5 km deep · 78 km away
  9. 2.723 km ENE of Ashford, Washington · 14130 days ago · 1 km deep · 65 km away
  10. 1.922 km ENE of Ashford, Washington · 14130 days ago · 0 km deep · 65 km away
  11. 1.510 km NE of Ashford, Washington · 14123 days ago · 10 km deep · 57 km away
  12. 1.620 km S of Morton, Washington · 14120 days ago · 9 km deep · 0 km away

Before

  1. 2.014 km NE of Kalama, Washington · 14180 days ago · 17 km deep · 46 km away
  2. 1.537 km NNE of Amboy, Washington · 14181 days ago · -2 km deep · 20 km away
  3. 1.522 km SSE of Packwood, Washington · 14190 days ago · -1 km deep · 49 km away
  4. 2.138 km NNE of Amboy, Washington · 14194 days ago · 4 km deep · 20 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10227958. Read Tue, Sep 22, 2026, 10:29 AM UTC.