Washington earthquakes

M2.1 earthquake 10 km SE of Orcas, Washington

A magnitude 2.1 earthquake struck 10 km SE of Orcas, Washington on Tue, Mar 28, 1978, 7:51 PM PST (03:51 UTC), 56 km (35 mi) below the surface.

A larger quake followed: M2.9 5 km WSW of Coupeville, 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
2.1 (md), micro
Local time
UTC
1978-03-29 03:51:03 UTC
Depth
55.8 km (34.7 mi), shallow
Epicenter
48.527° N, 122.846° 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 0.8 km horizontally, 1.0 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
127°
Stations used
11

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 2.95 km WSW of Coupeville, Washington · 17709 days ago · 21 km deep · 37 km away
  2. 1.67 km ESE of Deming, Washington · 17698 days ago · 8 km deep · 61 km away
  3. 1.97 km NE of Acme, Washington · 17693 days ago · -1 km deep · 59 km away
  4. 1.55 km SE of Hansville, Washington · 17682 days ago · 50 km deep · 76 km away
  5. 1.70 km W of Lyman, Washington · 17676 days ago · -1 km deep · 57 km away
  6. 2.35 km SE of Anacortes, Washington · 17672 days ago · 14 km deep · 22 km away
  7. 1.83 km N of Woods Creek, Washington · 17661 days ago · 5 km deep · 98 km away
  8. 2.57 km ESE of Deming, Washington · 17660 days ago · 2 km deep · 62 km away
  9. 2.52 km ENE of Lake McMurray, Washington · 17657 days ago · 5 km deep · 53 km away
  10. 1.57 km WSW of Ault Field, Washington · 17651 days ago · 15 km deep · 24 km away

Before

  1. 1.72 km W of La Conner, Washington · 17711 days ago · 22 km deep · 28 km away
  2. 1.58 km ENE of Marrowstone, Washington · 17732 days ago · 54 km deep · 53 km away
  3. 3.54 km NE of Blyn, Washington · 17732 days ago · 53 km deep · 53 km away
  4. 1.82 km SW of Suquamish, Washington · 17734 days ago · 17 km deep · 93 km away
  5. 1.61 km WNW of Larch Way, Washington · 17735 days ago · 13 km deep · 87 km away
  6. 1.51 km WNW of Freeland, Washington · 17736 days ago · 50 km deep · 61 km away
  7. 2.10 km NNW of Woodway, Washington · 17739 days ago · 11 km deep · 88 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10846358. Read Tue, Sep 22, 2026, 4:15 AM UTC.