Washington earthquakes

M1.6 earthquake 9 km WNW of Morton, Washington

A magnitude 1.6 earthquake struck 9 km WNW of Morton, Washington on Sun, Feb 26, 1978, 11:12 PM PST (07:12 UTC), 19 km (12 mi) below the surface.

A larger quake followed: M1.8 23 km N of Amboy, 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
1.6 (md), micro
Local time
UTC
1978-02-27 07:12:28 UTC
Depth
18.9 km (11.8 mi), shallow
Epicenter
46.593° N, 122.385° 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 0.5 km horizontally, 0.6 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
110°
Stations used
7

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 15 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 1.823 km N of Amboy, Washington · 17735 days ago · 12 km deep · 52 km away
  2. 1.911 km NE of Woodland, Washington · 17735 days ago · 4 km deep · 70 km away
  3. 4.85 km W of Burley, Washington · 17727 days ago · 22 km deep · 95 km away
  4. 1.53 km W of Burley, Washington · 17727 days ago · 22 km deep · 94 km away
  5. 1.85 km W of Burley, Washington · 17727 days ago · 22 km deep · 95 km away
  6. 2.25 km W of Burley, Washington · 17727 days ago · 21 km deep · 95 km away
  7. 1.74 km W of Burley, Washington · 17726 days ago · 21 km deep · 95 km away
  8. 1.54 km W of Burley, Washington · 17726 days ago · 25 km deep · 96 km away
  9. 4.16 km W of Burley, Washington · 17707 days ago · 21 km deep · 95 km away
  10. 1.86 km WNW of Burley, Washington · 17701 days ago · 23 km deep · 97 km away
  11. 1.86 km W of Burley, Washington · 17701 days ago · 22 km deep · 96 km away
  12. 1.537 km S of Morton, Washington · 17700 days ago · 11 km deep · 44 km away
  13. 1.818 km SE of Carbonado, Washington · 17697 days ago · 20 km deep · 55 km away
  14. 2.23 km WSW of Artondale, Washington · 17682 days ago · 23 km deep · 81 km away
  15. 1.72 km W of Artondale, Washington · 17680 days ago · 23 km deep · 81 km away

Before

  1. 1.64 km SSW of Orting, Washington · 17763 days ago · -1 km deep · 53 km away
  2. 1.68 km SSE of Mineral, Washington · 17765 days ago · 3 km deep · 18 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10845948. Read Tue, Sep 22, 2026, 9:56 AM UTC.