Washington earthquakes

M1.9 earthquake 8 km NW of Orcas, Washington

A magnitude 1.9 earthquake struck 8 km NW of Orcas, Washington on Sun, Sep 28, 1975, 11:00 PM PDT (06:00 UTC), 16 km (10 mi) below the surface.

A larger quake followed: M3.4 7 km WNW of Anacortes, 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
1975-09-29 06:00:42 UTC
Depth
15.8 km (9.8 mi), shallow
Epicenter
48.657° N, 123.027° 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 1.9 km horizontally, 1.6 km in depth
Magnitude uncertainty
±0.12
Depth from
Operator assigned
Station coverage gap
219°, poorly surrounded by stations
Stations used
9

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 1.65 km SE of Oak Harbor, Washington · 18621 days ago · 17 km deep · 54 km away
  2. 1.83 km S of Orcas, Washington · 18620 days ago · 3 km deep · 11 km away
  3. 1.63 km WNW of Victoria, Canada · 18619 days ago · 17 km deep · 36 km away
  4. 3.47 km WNW of Anacortes, Washington · 18616 days ago · 8 km deep · 27 km away
  5. 2.39 km ESE of Alger, Washington · 18607 days ago · 1 km deep · 60 km away
  6. 1.76 km NNW of Bangor Trident Base, Washington · 18606 days ago · 13 km deep · 100 km away
  7. 2.513 km W of Ault Field, Washington · 18588 days ago · 51 km deep · 39 km away
  8. 1.62 km SSE of Hansville, Washington · 18578 days ago · 1 km deep · 91 km away
  9. 2.13 km WNW of Langford, Canada · 18570 days ago · 20 km deep · 44 km away
  10. 2.06 km N of Kingston, Washington · 18562 days ago · 10 km deep · 98 km away
  11. 1.88 km NNW of Camano, Washington · 18562 days ago · 27 km deep · 58 km away

Before

  1. 2.56 km SE of Oak Harbor, Washington · 18622 days ago · 17 km deep · 55 km away
  2. 3.56 km SW of Clinton, Washington · 18625 days ago · 26 km deep · 92 km away
  3. 2.16 km WSW of Lake Cavanaugh, Washington · 18629 days ago · 2 km deep · 79 km away
  4. 1.96 km WSW of Lake Cavanaugh, Washington · 18633 days ago · 9 km deep · 79 km away
  5. 2.50 km ENE of Peaceful Valley, Washington · 18633 days ago · 11 km deep · 73 km away
  6. 2.06 km SW of Lake Cavanaugh, Washington · 18634 days ago · 11 km deep · 80 km away
  7. 2.66 km WSW of Lake Cavanaugh, Washington · 18634 days ago · 7 km deep · 79 km away
  8. 2.56 km WSW of Lake Cavanaugh, Washington · 18635 days ago · 3 km deep · 79 km away
  9. 1.83 km SSE of La Conner, Washington · 18638 days ago · -1 km deep · 52 km away
  10. 1.98 km S of Chilliwack, Canada · 18640 days ago · 6 km deep · 92 km away
  11. 2.53 km N of Kingston, Washington · 18651 days ago · 23 km deep · 99 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10861898. Read Tue, Sep 22, 2026, 10:00 AM UTC.