Washington earthquakes

M2.9 earthquake 25 km S of Morton, Washington

A magnitude 2.9 earthquake struck 25 km S of Morton, Washington on Tue, Sep 16, 1975, 7:43 PM PDT (02:43 UTC), 9 km (5 mi) below the surface.

A larger quake followed: M3.2 27 km NE 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
2.9 (md), micro
Local time
UTC
1975-09-17 02:43:27 UTC
Depth
8.7 km (5.4 mi), shallow
Epicenter
46.331° N, 122.265° 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 66.8 km horizontally, 99.9 km in depth
Magnitude uncertainty
±0.09
Depth from
Operator assigned
Station coverage gap
145°
Stations used
8

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 14 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 2.024 km S of Morton, Washington · 18641 days ago · 7 km deep · 2 km away
  2. 1.711 km NNW of Skamokawa Valley, Washington · 18641 days ago · 0 km deep · 90 km away
  3. 1.911 km W of Packwood, Washington · 18638 days ago · 4 km deep · 46 km away
  4. 1.724 km SE of Greenwater, Washington · 18635 days ago · 8 km deep · 94 km away
  5. 2.024 km S of Morton, Washington · 18634 days ago · -1 km deep · 1 km away
  6. 2.727 km S of Morton, Washington · 18621 days ago · 11 km deep · 2 km away
  7. 2.642 km SSE of Morton, Washington · 18618 days ago · 9 km deep · 20 km away
  8. 3.227 km NE of Amboy, Washington · 18617 days ago · 23 km deep · 26 km away
  9. 1.813 km NNW of Mossyrock, Washington · 18617 days ago · -1 km deep · 41 km away
  10. 2.213 km NNW of Mossyrock, Washington · 18617 days ago · 13 km deep · 41 km away
  11. 1.913 km SSE of Pe Ell, Washington · 18615 days ago · -1 km deep · 76 km away
  12. 2.218 km N of Mossyrock, Washington · 18607 days ago · 2 km deep · 44 km away
  13. 1.713 km WSW of Alder, Washington · 18606 days ago · -1 km deep · 48 km away
  14. 1.96 km SW of Morton, Washington · 18600 days ago · 11 km deep · 22 km away

Before

  1. 1.923 km SE of Greenwater, Washington · 18643 days ago · 2 km deep · 98 km away
  2. 2.425 km SSE of Morton, Washington · 18655 days ago · 8 km deep · 8 km away
  3. 2.038 km SSE of Morton, Washington · 18656 days ago · 4 km deep · 16 km away
  4. 2.61 km WNW of Crocker, Washington · 18656 days ago · 7 km deep · 85 km away
  5. 2.213 km NNE of Amboy, Washington · 18658 days ago · 5 km deep · 35 km away
  6. 3.06 km N of Olympia, Washington · 18665 days ago · 43 km deep · 98 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10861793. Read Wed, Sep 30, 2026, 6:58 PM UTC.