M1.8 earthquake 3 km SE of Union Gap, Washington
A magnitude 1.8 earthquake struck 3 km SE of Union Gap, Washington on Sun, Mar 16, 1986, 3:05 AM PST (11:05 UTC), 7 km (5 mi) below the surface.
A larger quake followed: M2.6 11 km SW of Quincy, Washington. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.8 (md), micro
- Local time
- UTC
- 1986-03-16 11:05:52 UTC
- Depth
- 7.3 km (4.5 mi), shallow
- Epicenter
- 46.534° N, 120.436° W
- Region
- Washington
- 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 0.1 km horizontally, 0.1 km in depth
- Magnitude uncertainty
- ±0.10
- Depth from
- Operator assigned
- Station coverage gap
- 142°
- 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: 7 in the 60 days after this one and 3 in the 30 days before it.
After
- 1.6Washington · 14798 days ago · 4 km deep · 95 km away
- 1.67 km WNW of Mattawa, Washington · 14795 days ago · 4 km deep · 43 km away
- 2.611 km SW of Quincy, Washington · 14783 days ago · 3 km deep · 79 km away
- 1.611 km NNW of Benton City, Washington · 14770 days ago · 17 km deep · 70 km away
- 1.623 km W of Cliffdell, Washington · 14766 days ago · 3 km deep · 85 km away
- 1.910 km SSW of Bickleton, Washington · 14766 days ago · 2 km deep · 68 km away
- 1.86 km NW of Mattawa, Washington · 14759 days ago · 0 km deep · 45 km away
Before
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10204278. Read Tue, Sep 29, 2026, 2:01 PM UTC.