Washington earthquakes

M2.1 earthquake 18 km N of Index, Washington

A magnitude 2.1 earthquake struck 18 km N of Index, Washington on Mon, Dec 26, 1977, 7:19 PM PST (03:19 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M2.3 6 km NNE of Lofall, 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
2.1 (md), micro
Local time
UTC
1977-12-27 03:19:52 UTC
Depth
4.8 km (3.0 mi), shallow
Epicenter
47.986° N, 121.507° 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 0.7 km horizontally, 1.9 km in depth
Depth from
From location
Station coverage gap
187°, poorly surrounded by stations
Stations used
8

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 14 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 1.718 km N of Index, Washington · 17802 days ago · 5 km deep · 0 km away
  2. 1.719 km N of Index, Washington · 17802 days ago · 8 km deep · 0 km away
  3. 1.817 km NE of May Creek, Washington · 17802 days ago · 8 km deep · 2 km away
  4. 2.09 km ENE of Carnation, Washington · 17801 days ago · 16 km deep · 41 km away
  5. 1.62 km NW of Maple Valley, Washington · 17799 days ago · 17 km deep · 77 km away
  6. 1.95 km SE of Monroe, Washington · 17798 days ago · 9 km deep · 36 km away
  7. 2.02 km SE of Bangor Trident Base, Washington · 17787 days ago · 48 km deep · 93 km away
  8. 1.71 km NNE of Cathcart, Washington · 17779 days ago · 17 km deep · 46 km away
  9. 2.36 km NNE of Lofall, Washington · 17772 days ago · 19 km deep · 84 km away
  10. 1.53 km WSW of Wilderness Rim, Washington · 17770 days ago · 19 km deep · 65 km away
  11. 1.95 km SE of Klahanie, Washington · 17761 days ago · 19 km deep · 60 km away
  12. 1.78 km S of Swede Heaven, Washington · 17756 days ago · 8 km deep · 30 km away
  13. 2.24 km SSW of La Conner, Washington · 17754 days ago · 17 km deep · 86 km away
  14. 1.63 km NNE of Hobart, Washington · 17742 days ago · 0 km deep · 69 km away

Before

  1. 1.60 km N of Southworth, Washington · 17805 days ago · 18 km deep · 91 km away
  2. 1.94 km NNE of Woods Creek, Washington · 17806 days ago · 12 km deep · 29 km away
  3. 2.18 km W of Entiat, Washington · 17807 days ago · 5 km deep · 95 km away
  4. 1.54 km ESE of Indianola, Washington · 17810 days ago · 15 km deep · 77 km away
  5. 1.54 km NW of Black Diamond, Washington · 17811 days ago · 12 km deep · 83 km away
  6. 1.63 km W of Suquamish, Washington · 17814 days ago · 24 km deep · 86 km away
  7. 1.87 km NNE of Bryant, Washington · 17816 days ago · 2 km deep · 58 km away
  8. 1.57 km WNW of Swede Heaven, Washington · 17817 days ago · 6 km deep · 42 km away
  9. 2.11 km WNW of Indianola, Washington · 17820 days ago · 18 km deep · 82 km away
  10. 1.70 km NNW of Clyde Hill, Washington · 17822 days ago · 21 km deep · 66 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10845423. Read Tue, Sep 22, 2026, 9:33 PM UTC.