M3.1 earthquake 19 km NNW of Halfway, Oregon

A magnitude 3.1 earthquake struck 19 km NNW of Halfway, Oregon on Mon, Aug 14, 2017, 12:20 AM PDT (07:20 UTC), 8 km (5 mi) below the surface.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
3.14	ML, local (Richter)	Pacific Northwest Seismic Network	Preferred · Final · ±0.083 · 7 stations
3.1	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.083 · 7 stations

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 0 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event uw61313606 (also filed as us2000a7yx). Read Sun, Oct 4, 2026, 10:48 PM UTC.