Washington earthquakes

M1.7 earthquake 16 km E of Mattawa, Washington

A magnitude 1.7 earthquake struck 16 km E of Mattawa, Washington on Wed, Oct 9, 1991, 6:53 AM PDT (13:53 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M1.8 19 km SE of Desert Aire, Washington. This one was a foreshock.

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.7 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1991-10-09 13:53:49 UTC
Depth
-0.3 km (-0.2 mi), shallow
Epicenter
46.742° N, 119.683° 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 0.1 km horizontally, 0.1 km in depth
Magnitude uncertainty
±0.06
Depth from
Operator assigned
Station coverage gap
51°
Stations used
13

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 10 in the 30 days before it.

After

  1. 1.59 km SSW of Prosser, Washington · 12761 days ago · 0 km deep · 69 km away
  2. 1.819 km SE of Desert Aire, Washington · 12750 days ago · 19 km deep · 22 km away
  3. 1.511 km SSW of Prosser, Washington · 12750 days ago · -1 km deep · 70 km away

Before

  1. 2.011 km SE of Bickleton, Washington · 12794 days ago · 15 km deep · 98 km away
  2. 1.96 km SE of Kittitas, Washington · 12796 days ago · 3 km deep · 56 km away
  3. 2.17 km SE of Kittitas, Washington · 12797 days ago · 3 km deep · 55 km away
  4. 1.57 km SSE of Kittitas, Washington · 12797 days ago · 5 km deep · 56 km away
  5. 1.917 km S of Ellensburg, Washington · 12800 days ago · 5 km deep · 66 km away
  6. 1.517 km E of Mattawa, Washington · 12804 days ago · 0 km deep · 0 km away
  7. 1.816 km E of Mattawa, Washington · 12804 days ago · 0 km deep · 0 km away
  8. 2.312 km ENE of Naches, Washington · 12804 days ago · 10 km deep · 68 km away
  9. 2.67 km SE of Kittitas, Washington · 12808 days ago · 3 km deep · 55 km away
  10. 2.78 km SE of Kittitas, Washington · 12809 days ago · 4 km deep · 54 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10279923. Read Mon, Oct 5, 2026, 7:53 AM UTC.