Washington earthquakes

M1.8 earthquake 20 km SSE of Prosser, Washington

A magnitude 1.8 earthquake struck 20 km SSE of Prosser, Washington on Sat, Dec 29, 1973, 1:37 AM PST (09:37 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M2.8 19 km SSE of Prosser, 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
1.8 (md), micro
Local time
UTC
1973-12-29 09:37:26 UTC
Depth
8.9 km (5.5 mi), shallow
Epicenter
46.036° N, 119.676° 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, 0.6 km in depth
Magnitude uncertainty
±0.16
Depth from
From location
Station coverage gap
248°, poorly surrounded by stations
Stations used
16

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 14 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 2.819 km SSE of Prosser, Washington · 19268 days ago · 11 km deep · 2 km away
  2. 2.019 km SSE of Prosser, Washington · 19268 days ago · 10 km deep · 0 km away
  3. 1.819 km SSE of Prosser, Washington · 19268 days ago · 10 km deep · 0 km away
  4. 2.319 km SSE of Prosser, Washington · 19268 days ago · 10 km deep · 1 km away
  5. 1.612 km NNE of Basin City, Washington · 19261 days ago · 1 km deep · 86 km away
  6. 2.714 km WNW of Othello, Washington · 19259 days ago · 0 km deep · 96 km away
  7. 1.516 km WNW of Othello, Washington · 19258 days ago · 0 km deep · 94 km away
  8. 1.614 km WSW of Othello, Washington · 19257 days ago · 1 km deep · 88 km away
  9. 2.013 km NNE of Basin City, Washington · 19244 days ago · 3 km deep · 87 km away
  10. 1.815 km WNW of Othello, Washington · 19243 days ago · 2 km deep · 95 km away
  11. 1.66 km S of Royal City, Washington · 19230 days ago · 0 km deep · 90 km away
  12. 1.614 km WNW of Othello, Washington · 19227 days ago · 0 km deep · 96 km away
  13. 2.34 km NE of Prosser, Washington · 19220 days ago · 0 km deep · 23 km away
  14. 2.24 km NE of Prosser, Washington · 19215 days ago · 0 km deep · 22 km away

Before

  1. 1.714 km WNW of Othello, Washington · 19275 days ago · 3 km deep · 95 km away
  2. 2.014 km WNW of Othello, Washington · 19278 days ago · 1 km deep · 96 km away
  3. 4.414 km WNW of Othello, Washington · 19278 days ago · 3 km deep · 96 km away
  4. 1.83 km SW of West Richland, Washington · 19292 days ago · 0 km deep · 35 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10858018. Read Wed, Sep 30, 2026, 4:19 PM UTC.