Washington earthquakes

M1.9 earthquake 6 km SE of Kittitas, Washington

A magnitude 1.9 earthquake struck 6 km SE of Kittitas, Washington on Mon, Sep 23, 1991, 11:45 AM PDT (18:45 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.0 7 km WSW of Chelan Falls, 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
1.9 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1991-09-23 18:45:04 UTC
Depth
2.9 km (1.8 mi), shallow
Epicenter
46.935° N, 120.360° 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, 0.9 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
65°
Stations used
21

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 1.78 km S of Leavenworth, Washington · 12788 days ago · 0 km deep · 69 km away
  2. 1.716 km E of Mattawa, Washington · 12778 days ago · 0 km deep · 56 km away
  3. 1.59 km SSW of Prosser, Washington · 12758 days ago · 0 km deep · 98 km away
  4. 1.819 km SE of Desert Aire, Washington · 12748 days ago · 19 km deep · 63 km away
  5. 1.511 km SSW of Prosser, Washington · 12747 days ago · -1 km deep · 99 km away
  6. 2.07 km WSW of Chelan Falls, Washington · 12745 days ago · 2 km deep · 97 km away

Before

  1. 2.17 km SE of Kittitas, Washington · 12795 days ago · 3 km deep · 0 km away
  2. 1.57 km SSE of Kittitas, Washington · 12795 days ago · 5 km deep · 1 km away
  3. 1.917 km S of Ellensburg, Washington · 12798 days ago · 5 km deep · 17 km away
  4. 1.517 km E of Mattawa, Washington · 12801 days ago · 0 km deep · 56 km away
  5. 1.816 km E of Mattawa, Washington · 12802 days ago · 0 km deep · 56 km away
  6. 2.312 km ENE of Naches, Washington · 12802 days ago · 10 km deep · 23 km away
  7. 2.67 km SE of Kittitas, Washington · 12806 days ago · 3 km deep · 1 km away
  8. 2.78 km SE of Kittitas, Washington · 12807 days ago · 4 km deep · 2 km away
  9. 1.96 km SE of Kittitas, Washington · 12822 days ago · 0 km deep · 1 km away
  10. 2.56 km SE of Kittitas, Washington · 12823 days ago · 3 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10281593. Read Sat, Oct 3, 2026, 6:07 AM UTC.