M3.1 earthquake 3 km W of Marshall, Oklahoma

A magnitude 3.1 earthquake struck 3 km W of Marshall, Oklahoma on Sat, Aug 15, 2020, 9:49 PM CDT (02:49 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.5 3 km SE of Meno, Oklahoma. This one was a foreshock.

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
3.09	ML, local (Richter)	Oklahoma Geological Survey	Preferred · Confirmed · ±0.23 · 37 stations
3.2	mb_Lg, Lg-wave body	USGS National Earthquake Information Center	Reviewed · ±0.041 · 156 stations

1 person reported to the USGS what they felt; the strongest reported shaking was III, 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: 154 in the 60 days after this one and 75 in the 30 days before it.

The first 60 of 154.

From the USGS Earthquake Hazards Program and its partner networks, event ok2020qauh (also filed as us6000bfes). Read Fri, Oct 2, 2026, 12:39 PM UTC.