Washington earthquakes

M2.8 earthquake 15 km N of Index, Washington

A magnitude 2.8 earthquake struck 15 km N of Index, Washington on Wed, Apr 21, 1971, 1:46 AM PST (09:46 UTC), 11 km (7 mi) below the surface.

May Creek 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
2.8 (md), micro
Local time
UTC
1971-04-21 09:46:27 UTC
Depth
11.2 km (6.9 mi), shallow
Epicenter
47.956° N, 121.526° 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 2.8 km horizontally, 9.4 km in depth
Magnitude uncertainty
±0.05
Depth from
Operator assigned
Station coverage gap
276°, 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: 10 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 2.16 km NNE of Snoqualmie, Washington · 20235 days ago · 12 km deep · 46 km away
  2. 2.02 km SW of Cottage Lake, Washington · 20228 days ago · 19 km deep · 50 km away
  3. 2.84 km NE of Duvall, Washington · 20224 days ago · 19 km deep · 37 km away
  4. 2.20 km W of Bryn Mawr-Skyway, Washington · 20220 days ago · 24 km deep · 75 km away
  5. 2.118 km E of Greenwater, Washington · 20213 days ago · 8 km deep · 92 km away
  6. 2.40 km NE of Lakeland South, Washington · 20198 days ago · 18 km deep · 93 km away
  7. 2.12 km ESE of Riverbend, Washington · 20195 days ago · 5 km deep · 58 km away
  8. 1.92 km ESE of Riverbend, Washington · 20195 days ago · 5 km deep · 57 km away
  9. 2.44 km NW of Coupeville, Washington · 20189 days ago · 22 km deep · 95 km away
  10. 2.027 km E of Skykomish, Washington · 20187 days ago · -1 km deep · 49 km away

Before

  1. 2.69 km NE of May Creek, Washington · 20244 days ago · 11 km deep · 6 km away
  2. 2.01 km WNW of Burien, Washington · 20252 days ago · 26 km deep · 82 km away
  3. 2.10 km SSW of Woodinville, Washington · 20256 days ago · 21 km deep · 53 km away
  4. 1.812 km ENE of Enumclaw, Washington · 20270 days ago · 22 km deep · 83 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10838928. Read Tue, Sep 22, 2026, 6:32 AM UTC.