Washington earthquakes

M1.8 earthquake 2 km E of Sammamish, Washington

A magnitude 1.8 earthquake struck 2 km E of Sammamish, Washington on Sat, May 13, 1978, 4:59 AM PDT (11:59 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M3.3 Puget Sound region, Washington. This one was a foreshock.

Sammamish 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
1.8 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1978-05-13 11:59:18 UTC
Depth
11.5 km (7.1 mi), shallow
Epicenter
47.644° N, 122.050° 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 0.3 km horizontally, 1.1 km in depth
Magnitude uncertainty
±0.08
Depth from
From location
Station coverage gap
113°
Stations used
16

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 12 in the 30 days before it.

After

  1. 1.83 km N of Woods Creek, Washington · 17672 days ago · 5 km deep · 32 km away
  2. 2.52 km ENE of Lake McMurray, Washington · 17668 days ago · 5 km deep · 76 km away
  3. 1.57 km WSW of Ault Field, Washington · 17662 days ago · 15 km deep · 92 km away
  4. 1.96 km NW of Shelton, Washington · 17647 days ago · 40 km deep · 95 km away
  5. 1.58 km SSW of Gold Bar, Washington · 17647 days ago · 3 km deep · 27 km away
  6. 2.24 km N of La Conner, Washington · 17640 days ago · 24 km deep · 93 km away
  7. 3.3Puget Sound region, Washington · 17637 days ago · 46 km deep · 51 km away
  8. 1.64 km SE of Three Lakes, Washington · 17623 days ago · 15 km deep · 31 km away
  9. 1.514 km NNE of Ashford, Washington · 17620 days ago · 3 km deep · 87 km away
  10. 1.6Washington · 17619 days ago · 3 km deep · 86 km away

Before

  1. 1.57 km W of Burley, Washington · 17678 days ago · 24 km deep · 56 km away
  2. 2.76 km SE of Shelton, Washington · 17679 days ago · 38 km deep · 91 km away
  3. 2.06 km WNW of Burley, Washington · 17679 days ago · 15 km deep · 55 km away
  4. 2.39 km SSW of Gold Bar, Washington · 17683 days ago · 3 km deep · 27 km away
  5. 2.35 km SE of Anacortes, Washington · 17684 days ago · 14 km deep · 100 km away
  6. 1.62 km N of Artondale, Washington · 17684 days ago · 20 km deep · 56 km away
  7. 1.92 km SSE of Belfair, Washington · 17686 days ago · 19 km deep · 62 km away
  8. 1.75 km W of Burley, Washington · 17687 days ago · 21 km deep · 55 km away
  9. 1.70 km W of Lyman, Washington · 17688 days ago · -1 km deep · 98 km away
  10. 1.72 km W of Artondale, Washington · 17692 days ago · 23 km deep · 60 km away
  11. 2.23 km WSW of Artondale, Washington · 17693 days ago · 23 km deep · 61 km away
  12. 1.55 km SE of Hansville, Washington · 17693 days ago · 50 km deep · 43 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10846883. Read Sat, Oct 3, 2026, 8:02 PM UTC.