Washington earthquakes

M1.6 earthquake 9 km SSW of Prosser, Washington

A magnitude 1.6 earthquake struck 9 km SSW of Prosser, Washington on Tue, Mar 26, 1991, 10:52 AM PST (18:52 UTC), 20 km (13 mi) below the surface.

A larger quake followed: M2.9 14 km SE of Desert Aire, Washington. This one was a foreshock.

Prosser 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
1.6 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1991-03-26 18:52:56 UTC
Depth
20.4 km (12.7 mi), shallow
Epicenter
46.120° N, 119.795° 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 0.8 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
94°
Stations used
22

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 2.55 km E of Wallula, Washington · 12967 days ago · 9 km deep · 74 km away
  2. 2.914 km SE of Desert Aire, Washington · 12956 days ago · 18 km deep · 53 km away
  3. 1.8Washington · 12955 days ago · 17 km deep · 52 km away
  4. 2.214 km SE of Desert Aire, Washington · 12954 days ago · 17 km deep · 52 km away
  5. 2.812 km NNE of Condon, Oregon · 12952 days ago · 13 km deep · 90 km away
  6. 1.923 km NW of Bickleton, Washington · 12949 days ago · 4 km deep · 54 km away
  7. 1.515 km E of Kittitas, Washington · 12941 days ago · 8 km deep · 100 km away
  8. 1.616 km E of Mattawa, Washington · 12934 days ago · 0 km deep · 69 km away

Before

  1. 2.59 km SSW of Prosser, Washington · 12977 days ago · 21 km deep · 1 km away
  2. 2.39 km SW of Royal City, Washington · 12984 days ago · 3 km deep · 81 km away
  3. 1.89 km WSW of Royal City, Washington · 12988 days ago · 0 km deep · 82 km away
  4. 1.610 km SW of Royal City, Washington · 12988 days ago · 2 km deep · 80 km away
  5. 1.89 km SW of Royal City, Washington · 12989 days ago · 3 km deep · 81 km away
  6. 1.66 km ENE of Naches, Washington · 12991 days ago · 6 km deep · 94 km away
  7. 1.67 km ENE of Naches, Washington · 12991 days ago · 6 km deep · 93 km away
  8. 3.02 km SSE of Mattawa, Washington · 13005 days ago · 1 km deep · 67 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10273458. Read Mon, Oct 5, 2026, 3:17 AM UTC.