Washington earthquakes

M1.7 earthquake 11 km SSW of Toppenish, Washington

A magnitude 1.7 earthquake struck 11 km SSW of Toppenish, Washington on Wed, Jul 31, 1985, 9:12 PM PDT (04:12 UTC), -1 km (0 mi) below the surface.

A larger quake followed: M2.6 11 km WSW of Ione, Oregon. 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
1985-08-01 04:12:27 UTC
Depth
-0.8 km (-0.5 mi), shallow
Epicenter
46.281° N, 120.353° 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 0.5 km horizontally, 0.7 km in depth
Magnitude uncertainty
±0.15
Depth from
Operator assigned
Station coverage gap
127°
Stations used
17

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 2.611 km WSW of Ione, Oregon · 15035 days ago · -1 km deep · 98 km away
  2. 1.76 km NW of Tieton, Washington · 15034 days ago · 5 km deep · 63 km away
  3. 2.19 km WSW of Royal City, Washington · 15018 days ago · 0 km deep · 81 km away
  4. 1.811 km SW of Ellensburg, Washington · 15015 days ago · 9 km deep · 75 km away
  5. 1.914 km NW of Mattawa, Washington · 15013 days ago · 0 km deep · 63 km away
  6. 1.715 km ENE of Packwood, Washington · 15013 days ago · 5 km deep · 98 km away
  7. 2.112 km SSW of Toppenish, Washington · 15010 days ago · -1 km deep · 1 km away
  8. 2.213 km WNW of Mattawa, Washington · 15001 days ago · 0 km deep · 62 km away
  9. 1.913 km WNW of Mattawa, Washington · 14982 days ago · 3 km deep · 62 km away
  10. 1.712 km WNW of Mattawa, Washington · 14981 days ago · 0 km deep · 62 km away

Before

  1. 3.230 km SW of White Swan, Washington · 15052 days ago · -1 km deep · 51 km away
  2. 1.67 km SSW of Highland, Washington · 15053 days ago · 6 km deep · 96 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10191438. Read Fri, Oct 2, 2026, 12:46 AM UTC.