Washington earthquakes

M1.5 earthquake 18 km NNE of Index, Washington

A magnitude 1.5 earthquake struck 18 km NNE of Index, Washington on Wed, Mar 25, 1981, 10:48 AM PST (18:48 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M2.2 4 km S of Coupeville, 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
1981-03-25 18:48:42 UTC
Depth
1.9 km (1.2 mi), shallow
Epicenter
47.986° N, 121.498° 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 0.5 km horizontally, 1.7 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
127°
Stations used
12

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 30 in the 60 days after this one and 15 in the 30 days before it.

After

  1. 2.24 km S of Coupeville, Washington · 16611 days ago · 25 km deep · 91 km away
  2. 2.79 km W of Entiat, Washington · 16611 days ago · 0 km deep · 93 km away
  3. 1.9Washington · 16609 days ago · 2 km deep · 77 km away
  4. 1.7Washington · 16609 days ago · 4 km deep · 2 km away
  5. 1.53 km SE of Echo Lake, Washington · 16608 days ago · 16 km deep · 45 km away
  6. 2.07 km ENE of Snoqualmie, Washington · 16608 days ago · 8 km deep · 50 km away
  7. 1.97 km ENE of Snoqualmie, Washington · 16608 days ago · 9 km deep · 51 km away
  8. 1.811 km NNE of Snoqualmie, Washington · 16605 days ago · 13 km deep · 45 km away
  9. 1.84 km SSW of Hamilton, Washington · 16598 days ago · 3 km deep · 68 km away
  10. 1.916 km NNE of May Creek, Washington · 16597 days ago · 7 km deep · 4 km away
  11. 2.43 km ENE of Sedro-Woolley, Washington · 16595 days ago · 3 km deep · 78 km away
  12. 1.56 km SSE of Alger, Washington · 16593 days ago · 10 km deep · 88 km away
  13. 2.42 km SSE of Maple Heights-Lake Desire, Washington · 16593 days ago · 17 km deep · 76 km away
  14. 1.77 km NNW of Kingston, Washington · 16588 days ago · 29 km deep · 80 km away
  15. 1.56 km NNE of Oso, Washington · 16588 days ago · 0 km deep · 48 km away
  16. 1.6Puget Sound region, Washington · 16584 days ago · 17 km deep · 89 km away
  17. 1.76 km NNE of Oso, Washington · 16581 days ago · 0 km deep · 49 km away
  18. 2.05 km NNE of Oso, Washington · 16581 days ago · 5 km deep · 47 km away
  19. 1.65 km NNE of Oso, Washington · 16581 days ago · 1 km deep · 48 km away
  20. 2.56 km NNE of Oso, Washington · 16581 days ago · 1 km deep · 47 km away
  21. 1.55 km NNE of Oso, Washington · 16581 days ago · 0 km deep · 48 km away
  22. 1.5Washington · 16579 days ago · 1 km deep · 48 km away
  23. 1.52 km SW of Roosevelt, Washington · 16577 days ago · 25 km deep · 42 km away
  24. 1.81 km SE of Enetai, Washington · 16572 days ago · 32 km deep · 93 km away
  25. 2.06 km NNE of Port Townsend, Washington · 16568 days ago · 21 km deep · 94 km away
  26. 2.40 km W of Mountlake Terrace, Washington · 16566 days ago · 23 km deep · 65 km away
  27. 1.519 km NNE of Index, Washington · 16564 days ago · 6 km deep · 1 km away
  28. 1.71 km SE of Redmond, Washington · 16563 days ago · 11 km deep · 58 km away
  29. 1.611 km NE of Snoqualmie, Washington · 16560 days ago · 2 km deep · 46 km away
  30. 1.68 km SSW of Concrete, Washington · 16560 days ago · 3 km deep · 57 km away

Before

  1. 2.47 km SSE of Coupeville, Washington · 16618 days ago · 25 km deep · 88 km away
  2. 1.74 km WNW of Burien, Washington · 16622 days ago · 17 km deep · 87 km away
  3. 1.56 km SE of Freeland, Washington · 16627 days ago · 50 km deep · 73 km away
  4. 2.410 km NE of Snoqualmie, Washington · 16627 days ago · 6 km deep · 47 km away
  5. 1.918 km N of Index, Washington · 16628 days ago · 5 km deep · 1 km away
  6. 1.618 km NE of May Creek, Washington · 16628 days ago · 6 km deep · 2 km away
  7. 1.518 km N of Index, Washington · 16628 days ago · 5 km deep · 1 km away
  8. 3.619 km NNE of Index, Washington · 16628 days ago · 5 km deep · 0 km away
  9. 1.615 km NNE of May Creek, Washington · 16629 days ago · 8 km deep · 5 km away
  10. 2.67 km NE of Snoqualmie Pass, Washington · 16633 days ago · 7 km deep · 61 km away
  11. 2.94 km E of Cle Elum, Washington · 16637 days ago · -1 km deep · 99 km away
  12. 1.75 km E of Carnation, Washington · 16638 days ago · 15 km deep · 45 km away
  13. 2.012 km N of Concrete, Washington · 16639 days ago · -1 km deep · 76 km away
  14. 2.83 km E of Cle Elum, Washington · 16641 days ago · -1 km deep · 99 km away
  15. 1.512 km E of Acme, Washington · 16647 days ago · -1 km deep · 91 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10107993. Read Wed, Sep 23, 2026, 6:31 PM UTC.