Washington earthquakes

M1.5 earthquake 14 km NW of Mattawa, Washington

A magnitude 1.5 earthquake struck 14 km NW of Mattawa, Washington on Thu, Oct 23, 1986, 3:28 PM PDT (22:28 UTC), 1 km (0 mi) below the surface.

A larger quake followed: M2.9 14 km S of Ellensburg, Washington. This one was a foreshock.

Mattawa 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
1.5 (md), micro
Local time
UTC
1986-10-23 22:28:33 UTC
Depth
0.8 km (0.5 mi), shallow
Epicenter
46.820° N, 120.046° 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 2.6 km horizontally, 0.7 km in depth
Magnitude uncertainty
±0.08
Depth from
From location
Station coverage gap
319°, 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: 3 in the 60 days after this one and 12 in the 30 days before it.

After

  1. 1.519 km W of White Swan, Washington · 14565 days ago · -1 km deep · 88 km away
  2. 2.914 km S of Ellensburg, Washington · 14563 days ago · 6 km deep · 40 km away
  3. 2.37 km NW of Mattawa, Washington · 14559 days ago · 1 km deep · 7 km away

Before

  1. 1.56 km NW of Mattawa, Washington · 14582 days ago · 1 km deep · 8 km away
  2. 1.76 km NW of Mattawa, Washington · 14593 days ago · 2 km deep · 8 km away
  3. 1.77 km NW of Mattawa, Washington · 14597 days ago · 2 km deep · 7 km away
  4. 1.75 km NW of Mattawa, Washington · 14604 days ago · 2 km deep · 9 km away
  5. 1.56 km NW of Mattawa, Washington · 14604 days ago · 3 km deep · 7 km away
  6. 1.67 km NW of Mattawa, Washington · 14604 days ago · 1 km deep · 7 km away
  7. 2.04 km NW of Mattawa, Washington · 14604 days ago · 4 km deep · 10 km away
  8. 2.46 km NW of Mattawa, Washington · 14605 days ago · 0 km deep · 8 km away
  9. 1.97 km NW of Mattawa, Washington · 14605 days ago · 0 km deep · 7 km away
  10. 2.410 km NNW of Mattawa, Washington · 14606 days ago · 5 km deep · 6 km away
  11. 2.16 km NW of Mattawa, Washington · 14607 days ago · 2 km deep · 8 km away
  12. 1.74 km NW of Mattawa, Washington · 14607 days ago · 1 km deep · 9 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10223873. Read Tue, Sep 22, 2026, 8:44 PM UTC.