Washington earthquakes

M1.9 earthquake 6 km SW of Morton, Washington

A magnitude 1.9 earthquake struck 6 km SW of Morton, Washington on Tue, Oct 28, 1975, 7:17 PM PST (03:17 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M2.1 1 km WSW of Gig Harbor, 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
1.9 (md), micro
Local time
UTC
1975-10-29 03:17:29 UTC
Depth
11.3 km (7.0 mi), shallow
Epicenter
46.522° N, 122.343° 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 1.0 km horizontally, 3.8 km in depth
Magnitude uncertainty
±0.20
Depth from
From location
Station coverage gap
152°
Stations used
6

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 1.96 km ESE of Maplewood, Washington · 18569 days ago · 16 km deep · 96 km away
  2. 2.11 km WSW of Gig Harbor, Washington · 18563 days ago · 33 km deep · 91 km away
  3. 1.914 km ESE of Ashford, Washington · 18536 days ago · 5 km deep · 42 km away
  4. 1.61 km ESE of Ravensdale, Washington · 18536 days ago · 18 km deep · 96 km away
  5. 2.112 km ESE of Ashford, Washington · 18536 days ago · 4 km deep · 40 km away

Before

  1. 1.713 km WSW of Alder, Washington · 18600 days ago · -1 km deep · 26 km away
  2. 2.218 km N of Mossyrock, Washington · 18601 days ago · 2 km deep · 23 km away
  3. 1.913 km SSE of Pe Ell, Washington · 18609 days ago · -1 km deep · 69 km away
  4. 2.213 km NNW of Mossyrock, Washington · 18610 days ago · 13 km deep · 21 km away
  5. 1.813 km NNW of Mossyrock, Washington · 18611 days ago · -1 km deep · 21 km away
  6. 3.227 km NE of Amboy, Washington · 18611 days ago · 23 km deep · 47 km away
  7. 2.642 km SSE of Morton, Washington · 18611 days ago · 9 km deep · 40 km away
  8. 2.727 km S of Morton, Washington · 18614 days ago · 11 km deep · 24 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10862113. Read Thu, Sep 24, 2026, 1:43 PM UTC.