Washington earthquakes

M1.8 earthquake 1 km S of Hamilton, Washington

A magnitude 1.8 earthquake struck 1 km S of Hamilton, Washington on Tue, Aug 19, 1986, 5:48 AM PDT (12:48 UTC), -1 km (-1 mi) below the surface.

A larger quake followed: M2.8 20 km E of Verlot, Washington. This one was a foreshock.

Concrete 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), micro
Local time
UTC
1986-08-19 12:48:56 UTC
Depth
-0.9 km (-0.5 mi), shallow
Epicenter
48.506° N, 121.988° 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 0.1 km horizontally, 0.2 km in depth
Magnitude uncertainty
±0.08
Depth from
Operator assigned
Station coverage gap
88°
Stations used
14

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 16 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 1.917 km E of Verlot, Washington · 14642 days ago · 7 km deep · 59 km away
  2. 2.11 km N of Bothell West, Washington · 14642 days ago · 20 km deep · 79 km away
  3. 1.8Washington · 14637 days ago · -1 km deep · 61 km away
  4. 1.514 km ESE of Verlot, Washington · 14636 days ago · 9 km deep · 58 km away
  5. 2.317 km E of Verlot, Washington · 14636 days ago · 6 km deep · 59 km away
  6. 1.60 km S of Oak Harbor, Washington · 14634 days ago · 19 km deep · 54 km away
  7. 2.4Washington-British Columbia border region · 14632 days ago · 48 km deep · 94 km away
  8. 2.3Puget Sound region, Washington · 14631 days ago · 13 km deep · 88 km away
  9. 1.64 km SW of Darrington, Washington · 14622 days ago · 1 km deep · 41 km away
  10. 2.820 km E of Verlot, Washington · 14621 days ago · 5 km deep · 60 km away
  11. 2.417 km ESE of Verlot, Washington · 14621 days ago · 7 km deep · 59 km away
  12. 2.43 km N of Hamilton, Washington · 14611 days ago · -1 km deep · 5 km away
  13. 2.23 km N of Hamilton, Washington · 14609 days ago · -1 km deep · 5 km away
  14. 1.72 km E of Kirkland, Washington · 14607 days ago · 14 km deep · 93 km away
  15. 2.215 km ESE of Acme, Washington · 14605 days ago · -1 km deep · 20 km away
  16. 2.320 km SSE of Marblemount, Washington · 14599 days ago · 9 km deep · 49 km away

Before

  1. 1.851 km SE of Marblemount, Washington · 14655 days ago · -1 km deep · 85 km away
  2. 1.63 km WSW of Lake Marcel-Stillwater, Washington · 14660 days ago · 18 km deep · 92 km away
  3. 2.0Washington-British Columbia border region · 14678 days ago · 15 km deep · 83 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10211883. Read Mon, Sep 28, 2026, 10:51 AM UTC.