Washington earthquakes

M2.2 earthquake Washington

A magnitude 2.2 earthquake struck in Washington on Mon, Dec 20, 1999, 8:28 AM PST (16:28 UTC), 17 km (11 mi) below the surface.

A larger quake followed: M3.0 6 km W of Lofall, 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
2.2 (md), micro
Local time
UTC
1999-12-20 16:28:15 UTC
Depth
17.3 km (10.7 mi), shallow
Epicenter
47.175° N, 121.943° 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 0.0 km horizontally, 0.0 km in depth
Magnitude uncertainty
±0.04
Depth from
Operator assigned
Station coverage gap
56°
Stations used
45

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 4 in the 30 days before it.

After

  1. 1.92 km NNE of Bonney Lake, Washington · 9778 days ago · 14 km deep · 17 km away
  2. 2.019 km NNE of Ashford, Washington · 9775 days ago · 12 km deep · 29 km away
  3. 1.614 km SSE of Carbonado, Washington · 9774 days ago · 12 km deep · 24 km away
  4. 1.61 km NNW of Mirrormont, Washington · 9758 days ago · 21 km deep · 34 km away
  5. 1.53 km NE of East Renton Highlands, Washington · 9753 days ago · 12 km deep · 39 km away
  6. 1.53 km NE of East Renton Highlands, Washington · 9753 days ago · 12 km deep · 38 km away
  7. 3.06 km W of Lofall, Washington · 9753 days ago · 17 km deep · 93 km away
  8. 1.93 km ENE of Bonney Lake, Washington · 9751 days ago · 14 km deep · 15 km away
  9. 2.20 km NNE of Gorst, Washington · 9750 days ago · 7 km deep · 69 km away
  10. 1.82 km ENE of Gig Harbor, Washington · 9748 days ago · 48 km deep · 49 km away
  11. 2.122 km ENE of Ashford, Washington · 9742 days ago · -1 km deep · 39 km away
  12. 1.63 km W of Black Diamond, Washington · 9741 days ago · 11 km deep · 17 km away
  13. 1.711 km SSE of Mineral, Washington · 9736 days ago · 18 km deep · 63 km away
  14. 2.63 km SSW of Easton, Washington · 9723 days ago · 2 km deep · 56 km away

Before

  1. 2.113 km W of Greenwater, Washington · 9793 days ago · 14 km deep · 9 km away
  2. 1.93 km ENE of Monroe North, Washington · 9796 days ago · 16 km deep · 80 km away
  3. 1.621 km S of Morton, Washington · 9798 days ago · 7 km deep · 92 km away
  4. 2.06 km SSE of Vashon, Washington · 9801 days ago · 18 km deep · 44 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10487373. Read Tue, Sep 29, 2026, 11:24 AM UTC.