M2.8 earthquake 7 km NE of Lake Aluma, Oklahoma

A magnitude 2.8 earthquake struck 7 km NE of Lake Aluma, Oklahoma on Sun, Sep 20, 2020, 5:07 PM CDT (22:07 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M3.2 3 km W of Lucien, 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
2.78	ML, local (Richter)	Oklahoma Geological Survey	Preferred · Confirmed · ±0.26 · 42 stations
2.5	mb_Lg, Lg-wave body	USGS National Earthquake Information Center	Reviewed · ±0.071 · 51 stations

71 people reported to the USGS what they felt; the strongest reported shaking was V, moderate 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: 85 in the 60 days after this one and 28 in the 30 days before it.

The first 60 of 85.

From the USGS Earthquake Hazards Program and its partner networks, event ok2020sofc (also filed as us7000bqkv). Read Sun, Oct 4, 2026, 8:31 AM UTC.