Washington earthquakes

M1.5 earthquake 6 km NW of Mattawa, Washington

A magnitude 1.5 earthquake struck 6 km NW of Mattawa, Washington on Mon, Oct 20, 1986, 6:12 PM PDT (01:12 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M2.9 14 km S of Ellensburg, 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
1986-10-21 01:12:01 UTC
Depth
1.1 km (0.7 mi), shallow
Epicenter
46.777° N, 119.966° 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, 1.2 km in depth
Magnitude uncertainty
±0.08
Depth from
From location
Station coverage gap
82°
Stations used
20

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 1.514 km NW of Mattawa, Washington · 14591 days ago · 1 km deep · 8 km away
  2. 1.519 km W of White Swan, Washington · 14577 days ago · -1 km deep · 90 km away
  3. 2.914 km S of Ellensburg, Washington · 14576 days ago · 6 km deep · 47 km away
  4. 2.37 km NW of Mattawa, Washington · 14571 days ago · 1 km deep · 1 km away

Before

  1. 1.76 km NW of Mattawa, Washington · 14606 days ago · 2 km deep · 1 km away
  2. 1.77 km NW of Mattawa, Washington · 14609 days ago · 2 km deep · 1 km away
  3. 1.75 km NW of Mattawa, Washington · 14616 days ago · 2 km deep · 1 km away
  4. 1.56 km NW of Mattawa, Washington · 14616 days ago · 3 km deep · 1 km away
  5. 1.67 km NW of Mattawa, Washington · 14617 days ago · 1 km deep · 1 km away
  6. 2.04 km NW of Mattawa, Washington · 14617 days ago · 4 km deep · 2 km away
  7. 2.46 km NW of Mattawa, Washington · 14617 days ago · 0 km deep · 0 km away
  8. 1.97 km NW of Mattawa, Washington · 14617 days ago · 0 km deep · 1 km away
  9. 2.410 km NNW of Mattawa, Washington · 14618 days ago · 5 km deep · 5 km away
  10. 2.16 km NW of Mattawa, Washington · 14619 days ago · 2 km deep · 0 km away
  11. 1.74 km NW of Mattawa, Washington · 14620 days ago · 1 km deep · 2 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10219988. Read Mon, Oct 5, 2026, 6:18 AM UTC.