Washington earthquakes

M1.5 earthquake 15 km SW of Alder, Washington

A magnitude 1.5 earthquake struck 15 km SW of Alder, Washington on Fri, Sep 3, 1976, 3:48 PM PDT (22:48 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M1.9 4 km W of Packwood, 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
1.5 (md), micro
Local time
UTC
1976-09-03 22:48:23 UTC
Depth
9.0 km (5.6 mi), shallow
Epicenter
46.697° N, 122.424° 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 2.7 km horizontally
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
133°
Stations used
5

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 21 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 1.94 km W of Packwood, Washington · 18278 days ago · 5 km deep · 54 km away
  2. 4.52 km NNE of Union, Washington · 18276 days ago · 45 km deep · 91 km away
  3. 1.730 km N of Amboy, Washington · 18275 days ago · 1 km deep · 57 km away
  4. 1.611 km S of Ashford, WA · 18275 days ago · 38 km deep · 29 km away
  5. 1.63 km NNW of White Center, Washington · 18272 days ago · 12 km deep · 94 km away
  6. 1.716 km NNE of Mossyrock, Washington · 18269 days ago · 12 km deep · 2 km away
  7. 1.7Puget Sound region, Washington · 18268 days ago · 18 km deep · 91 km away
  8. 2.212 km N of Ashford, Washington · 18258 days ago · 3 km deep · 36 km away
  9. 1.6Washington · 18250 days ago · 13 km deep · 94 km away
  10. 2.417 km NE of Ashford, Washington · 18250 days ago · 14 km deep · 46 km away
  11. 1.75 km ENE of Belfair, Washington · 18245 days ago · 19 km deep · 89 km away
  12. 2.014 km NNW of Morton, Washington · 18244 days ago · 11 km deep · 6 km away
  13. 2.05 km NNW of Onalaska, Washington · 18242 days ago · 42 km deep · 26 km away
  14. 4.014 km NNW of Morton, Washington · 18240 days ago · 16 km deep · 5 km away
  15. 2.113 km WSW of Mineral, Washington · 18239 days ago · 16 km deep · 6 km away
  16. 2.42 km NE of Maple Valley, Washington · 18236 days ago · 13 km deep · 85 km away
  17. 1.97 km ENE of Hobart, Washington · 18234 days ago · 22 km deep · 94 km away
  18. 1.91 km W of Hobart, Washington · 18234 days ago · 18 km deep · 87 km away
  19. 1.84 km S of Orting, Washington · 18234 days ago · -1 km deep · 43 km away
  20. 1.96 km N of Packwood, Washington · 18230 days ago · 1 km deep · 57 km away
  21. 2.211 km S of Greenwater, Washington · 18228 days ago · 4 km deep · 70 km away

Before

  1. 1.628 km NW of Trout Lake, Washington · 18282 days ago · 9 km deep · 76 km away
  2. 1.65 km SSW of Fall City, Washington · 18283 days ago · 25 km deep · 100 km away
  3. 1.710 km W of Skokomish, Washington · 18288 days ago · 8 km deep · 96 km away
  4. 1.53 km WSW of Issaquah, Washington · 18290 days ago · 11 km deep · 95 km away
  5. 1.61 km ENE of Riverton, Washington · 18294 days ago · 24 km deep · 89 km away
  6. 1.60 km ESE of Boulevard Park, Washington · 18295 days ago · 32 km deep · 88 km away
  7. 2.221 km SSE of Mossyrock, Washington · 18296 days ago · 3 km deep · 38 km away
  8. 1.510 km WNW of Packwood, Washington · 18296 days ago · -1 km deep · 48 km away
  9. 2.031 km S of Morton, Washington · 18297 days ago · 18 km deep · 48 km away
  10. 1.65 km ENE of Onalaska, Washington · 18308 days ago · 23 km deep · 21 km away
  11. 1.739 km SSE of Morton, Washington · 18309 days ago · 4 km deep · 59 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10842153. Read Tue, Sep 22, 2026, 9:11 AM UTC.