Washington earthquakes

M1.6 earthquake 8 km WNW of Concrete, Washington

A magnitude 1.6 earthquake struck 8 km WNW of Concrete, Washington on Mon, Feb 22, 1988, 8:51 PM PST (04:51 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M2.9 6 km SW of Lyman, 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
1.6 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1988-02-23 04:51:57 UTC
Depth
2.4 km (1.5 mi), shallow
Epicenter
48.582° N, 121.848° 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 0.9 km horizontally, 2.6 km in depth
Magnitude uncertainty
±0.07
Depth from
Operator assigned
Station coverage gap
130°
Stations used
7

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 6 in the 30 days before it.

After

  1. 2.210 km E of Point Roberts, Washington · 14095 days ago · 7 km deep · 90 km away
  2. 1.71 km N of Lake Forest Park, Washington · 14094 days ago · 16 km deep · 96 km away
  3. 1.54 km E of Lake Ketchum, Washington · 14085 days ago · 13 km deep · 47 km away
  4. 1.72 km WNW of Lake Marcel-Stillwater, Washington · 14083 days ago · 25 km deep · 98 km away
  5. 2.55 km WSW of Darrington, Washington · 14082 days ago · 2 km deep · 41 km away
  6. 2.02 km ESE of Cathcart, Washington · 14081 days ago · 22 km deep · 84 km away
  7. 1.612 km WNW of Orcas, Washington · 14080 days ago · 16 km deep · 92 km away
  8. 2.03 km NNE of Glacier, Washington · 14069 days ago · -1 km deep · 37 km away
  9. 1.52 km NE of Glacier, Washington · 14069 days ago · 0 km deep · 37 km away
  10. 1.810 km NW of Swede Heaven, Washington · 14067 days ago · -1 km deep · 25 km away
  11. 2.96 km SW of Lyman, Washington · 14060 days ago · 1 km deep · 23 km away

Before

  1. 1.915 km SE of Verlot, Washington · 14118 days ago · 4 km deep · 66 km away
  2. 1.716 km SE of Verlot, Washington · 14119 days ago · 2 km deep · 67 km away
  3. 1.715 km SE of Verlot, Washington · 14119 days ago · 0 km deep · 66 km away
  4. 1.715 km SE of Verlot, Washington · 14120 days ago · 3 km deep · 66 km away
  5. 2.32 km SW of Monroe, Washington · 14122 days ago · 23 km deep · 83 km away
  6. 1.61 km NW of Lake Marcel-Stillwater, Washington · 14124 days ago · 4 km deep · 98 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10230488. Read Thu, Oct 1, 2026, 3:27 PM UTC.