Washington earthquakes

M2.2 earthquake 4 km SE of Riverbend, Washington

A magnitude 2.2 earthquake struck 4 km SE of Riverbend, Washington on Tue, Sep 21, 1971, 3:44 PM PDT (22:44 UTC), -1 km (0 mi) below the surface.

A larger quake followed: M3.1 1 km ESE of Swede Heaven, Washington. This one was a foreshock.

Riverbend 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
2.2 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1971-09-21 22:44:31 UTC
Depth
-0.7 km (-0.4 mi), shallow
Epicenter
47.441° N, 121.706° 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 0.2 km horizontally, 0.2 km in depth
Magnitude uncertainty
±0.11
Depth from
Operator assigned
Station coverage gap
242°, poorly surrounded by stations
Stations used
6

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 18 in the 60 days after this one and 12 in the 30 days before it.

After

  1. 1.70 km NNE of Beaux Arts Village, Washington · 20088 days ago · 20 km deep · 40 km away
  2. 2.30 km NE of Mercer Island, Washington · 20087 days ago · 20 km deep · 41 km away
  3. 1.80 km NE of Beaux Arts Village, Washington · 20087 days ago · 20 km deep · 40 km away
  4. 2.1Washington · 20084 days ago · 21 km deep · 5 km away
  5. 1.81 km SSW of Wilderness Rim, Washington · 20083 days ago · 20 km deep · 5 km away
  6. 2.11 km WNW of Federal Way, Washington · 20080 days ago · 28 km deep · 49 km away
  7. 2.42 km WSW of Suquamish, Washington · 20073 days ago · 18 km deep · 73 km away
  8. 2.81 km ENE of Keyport, Washington · 20069 days ago · 21 km deep · 74 km away
  9. 1.72 km NNE of Bonney Lake, Washington · 20069 days ago · 10 km deep · 44 km away
  10. 2.15 km WNW of Wauna, Washington · 20068 days ago · 19 km deep · 76 km away
  11. 1.80 km ENE of Beaux Arts Village, Washington · 20067 days ago · 21 km deep · 40 km away
  12. 2.30 km NE of Beaux Arts Village, Washington · 20063 days ago · 20 km deep · 40 km away
  13. 3.05 km N of Bangor Trident Base, Washington · 20062 days ago · 54 km deep · 85 km away
  14. 3.11 km ESE of Swede Heaven, Washington · 20048 days ago · 9 km deep · 93 km away
  15. 1.74 km ESE of Issaquah, Washington · 20047 days ago · 19 km deep · 22 km away
  16. 2.80 km ESE of Mukilteo, Washington · 20044 days ago · 62 km deep · 71 km away
  17. 1.60 km NW of Wilburton, Washington · 20039 days ago · 19 km deep · 41 km away
  18. 1.51 km SW of Mountlake Terrace, Washington · 20039 days ago · 27 km deep · 60 km away

Before

  1. 1.94 km NNE of Seattle, Washington · 20101 days ago · 19 km deep · 51 km away
  2. 2.43 km E of Pacific, Washington · 20108 days ago · 14 km deep · 42 km away
  3. 2.30 km NW of Beaux Arts Village, Washington · 20111 days ago · 21 km deep · 41 km away
  4. 2.01 km NNE of Mercer Island, Washington · 20111 days ago · 20 km deep · 41 km away
  5. 1.92 km SE of Lake Marcel-Stillwater, Washington · 20111 days ago · 23 km deep · 29 km away
  6. 3.50 km ESE of Mercer Island, Washington · 20111 days ago · 20 km deep · 41 km away
  7. 2.75 km NE of Woods Creek, Washington · 20112 days ago · 18 km deep · 54 km away
  8. 2.14 km NE of Ashford, Washington · 20114 days ago · 9 km deep · 76 km away
  9. 2.61 km SE of Burley, Washington · 20122 days ago · 15 km deep · 69 km away
  10. 1.87 km SE of Snoqualmie Pass, Washington · 20125 days ago · 0 km deep · 31 km away
  11. 2.55 km NE of Ashford, Washington · 20126 days ago · 8 km deep · 75 km away
  12. 1.77 km SE of Snoqualmie Pass, Washington · 20127 days ago · 0 km deep · 31 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10839783. Read Thu, Oct 1, 2026, 9:06 PM UTC.