Washington earthquakes

M1.8 earthquake 4 km NE of Tampico, Washington

A magnitude 1.8 earthquake struck 4 km NE of Tampico, Washington on Fri, Mar 9, 1984, 9:51 AM PST (17:51 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.8 20 km SSW of Prosser, 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
1.8 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1984-03-09 17:51:33 UTC
Depth
2.9 km (1.8 mi), shallow
Epicenter
46.563° N, 120.822° 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 1.1 km horizontally, 1.7 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
130°
Stations used
15

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 7 in the 30 days before it.

After

  1. 1.9Washington · 15541 days ago · -1 km deep · 43 km away
  2. 1.9Washington · 15541 days ago · 0 km deep · 24 km away
  3. 1.77 km SW of South Cle Elum, Washington · 15534 days ago · 8 km deep · 66 km away
  4. 2.023 km ENE of Ashford, Washington · 15531 days ago · 4 km deep · 79 km away
  5. 2.016 km SE of Carbonado, Washington · 15517 days ago · 7 km deep · 95 km away
  6. 2.111 km E of Kittitas, Washington · 15505 days ago · 0 km deep · 63 km away
  7. 1.72 km NW of Tieton, Washington · 15498 days ago · 12 km deep · 18 km away
  8. 1.615 km E of Wilkeson, Washington · 15498 days ago · 6 km deep · 98 km away
  9. 2.820 km SSW of Prosser, Washington · 15496 days ago · -1 km deep · 93 km away
  10. 1.88 km E of Ashford, Washington · 15495 days ago · 13 km deep · 87 km away

Before

  1. 1.81 km WSW of Selah, Washington · 15549 days ago · 5 km deep · 23 km away
  2. 1.614 km SSE of Kittitas, Washington · 15550 days ago · 0 km deep · 49 km away
  3. 1.511 km NNE of Ashford, Washington · 15550 days ago · 11 km deep · 92 km away
  4. 1.612 km ENE of Naches, Washington · 15561 days ago · 8 km deep · 33 km away
  5. 1.64 km W of South Wenatchee, Washington · 15569 days ago · 3 km deep · 98 km away
  6. 1.823 km ESE of Packwood, Washington · 15572 days ago · 3 km deep · 44 km away
  7. 1.620 km ESE of Desert Aire, Washington · 15576 days ago · 0 km deep · 88 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10173203. Read Sat, Oct 3, 2026, 4:15 AM UTC.