Washington earthquakes

M1.5 earthquake 9 km NNE of Waterville, Washington

A magnitude 1.5 earthquake struck 9 km NNE of Waterville, Washington on Mon, Feb 20, 1984, 1:37 AM PST (09:37 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M4.3 13 km ENE of Sunnyslope, 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, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1984-02-20 09:37:29 UTC
Depth
6.7 km (4.2 mi), shallow
Epicenter
47.716° N, 120.006° 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 0.4 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
82°
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: 11 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 2.06 km NE of Waterville, Washington · 15561 days ago · 3 km deep · 3 km away
  2. 1.54 km N of Entiat, Washington · 15558 days ago · 3 km deep · 15 km away
  3. 1.95 km W of Entiat, Washington · 15556 days ago · 7 km deep · 21 km away
  4. 1.55 km SW of Entiat, Washington · 15549 days ago · 0 km deep · 21 km away
  5. 1.614 km SSE of Kittitas, Washington · 15548 days ago · 0 km deep · 99 km away
  6. 2.111 km N of Sunnyslope, Washington · 15537 days ago · 9 km deep · 29 km away
  7. 2.25 km ESE of Entiat, Washington · 15530 days ago · 0 km deep · 13 km away
  8. 1.67 km NW of Entiat, Washington · 15529 days ago · 7 km deep · 20 km away
  9. 1.92 km ESE of Entiat, Washington · 15516 days ago · 0 km deep · 14 km away
  10. 4.313 km ENE of Sunnyslope, Washington · 15513 days ago · 7 km deep · 24 km away
  11. 2.06 km SSW of Chelan Falls, Washington · 15513 days ago · 5 km deep · 3 km away

Before

  1. 2.38 km SSE of Leavenworth, Washington · 15565 days ago · 6 km deep · 51 km away
  2. 1.513 km W of Entiat, Washington · 15566 days ago · 0 km deep · 29 km away
  3. 1.64 km W of South Wenatchee, Washington · 15568 days ago · 3 km deep · 45 km away
  4. 1.66 km NE of Waterville, Washington · 15579 days ago · 1 km deep · 3 km away
  5. 2.312 km WSW of Entiat, Washington · 15586 days ago · 3 km deep · 29 km away
  6. 1.912 km E of Chelan Falls, Washington · 15589 days ago · 0 km deep · 18 km away
  7. 1.632 km NNW of Leavenworth, Washington · 15592 days ago · 6 km deep · 59 km away
  8. 1.813 km WSW of Entiat, Washington · 15593 days ago · 1 km deep · 29 km away
  9. 1.98 km ENE of Kittitas, Washington · 15594 days ago · 4 km deep · 83 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10178533. Read Thu, Oct 1, 2026, 12:23 PM UTC.