M1.9 earthquake 23 km W of Loomis, Washington
A magnitude 1.9 earthquake struck 23 km W of Loomis, Washington on Wed, May 21, 1986, 5:34 AM PDT (12:34 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M3.3 23 km WSW of Princeton, Canada. 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
- 1986-05-21 12:34:26 UTC
- Depth
- 9.9 km (6.1 mi), shallow
- Epicenter
- 48.823° N, 119.957° 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 2.5 km horizontally, 1.6 km in depth
- Magnitude uncertainty
- ±0.05
- Depth from
- From location
- Station coverage gap
- 253°, poorly surrounded by stations
- Stations used
- 8
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 1 in the 30 days before it.
After
- 3.323 km WSW of Princeton, Canada · 14720 days ago · 18 km deep · 84 km away
- 2.121 km WNW of Princeton, Canada · 14682 days ago · 11 km deep · 97 km away
Before
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10212648. Read Mon, Sep 28, 2026, 5:45 PM UTC.