M1.9 earthquake 10 km NNW of Pilot Rock, Oregon
A magnitude 1.9 earthquake struck 10 km NNW of Pilot Rock, Oregon on Fri, May 18, 1984, 9:23 AM PDT (16:23 UTC), 11 km (7 mi) below the surface.
A larger quake followed: M2.7 4 km E of Umapine, Oregon. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.9 (md), micro
- Local time
- UTC
- 1984-05-18 16:23:03 UTC
- Depth
- 11.5 km (7.1 mi), shallow
- Epicenter
- 45.574° N, 118.875° W
- Region
- Oregon
- 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 9.6 km horizontally, 3.9 km in depth
- Magnitude uncertainty
- ±0.12
- Depth from
- From location
- Station coverage gap
- 264°, poorly surrounded by stations
- Stations used
- 5
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 4 in the 30 days before it.
After
- 2.74 km E of Umapine, Oregon · 15448 days ago · 6 km deep · 56 km away
- 2.121 km NE of Lexington, Oregon · 15440 days ago · 21 km deep · 45 km away
- 3.122 km ENE of Ukiah, Oregon · 15436 days ago · 10 km deep · 41 km away
- 2.121 km E of Ukiah, Oregon · 15427 days ago · 0 km deep · 49 km away
- 2.02 km SW of West Richland, Washington · 15426 days ago · 7 km deep · 88 km away
Before
- 2.013 km WSW of Highland, Washington · 15479 days ago · 18 km deep · 64 km away
- 2.15 km W of Pendleton, Oregon · 15483 days ago · -1 km deep · 11 km away
- 1.98 km ESE of Waitsburg, Washington · 15484 days ago · 9 km deep · 99 km away
- 2.820 km SSW of Prosser, Washington · 15485 days ago · -1 km deep · 94 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10176053. Read Tue, Sep 22, 2026, 9:30 PM UTC.