M1.6 earthquake 21 km N of Halfway, Oregon
A magnitude 1.6 earthquake struck 21 km N of Halfway, Oregon on Sun, Aug 20, 2017, 9:29 AM PDT (16:29 UTC), 4 km (2 mi) below the surface.
A larger quake followed: M3.0 22 km N of Halfway, Oregon. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.6 (ML, local (Richter)), micro
- Magnitude from
- Pacific Northwest Seismic Network
- Local time
- UTC
- 2017-08-20 16:29:25 UTC
- Depth
- 3.8 km (2.4 mi), shallow
- Epicenter
- 45.076° N, 117.104° 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 7.6 km horizontally, 24.5 km in depth
- Magnitude uncertainty
- ±0.04
- Depth from
- Operator assigned
- Station coverage gap
- 218°, poorly surrounded by stations
- Stations used
- 3
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 4 in the 30 days before it.
After
- 3.022 km N of Halfway, Oregon · 3330 days ago · 2 km deep · 2 km away
- 2.220 km N of Halfway, Oregon · 3329 days ago · 5 km deep · 2 km away
- 2.339 km WNW of White Bird, Idaho · 3319 days ago · 5 km deep · 91 km away · felt by 1
- 2.626 km NW of New Meadows, Idaho · 3312 days ago · 5 km deep · 43 km away
Before
Earthquakes todayOregon earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw61296197. Read Fri, Oct 2, 2026, 10:28 PM UTC.