M1.9 earthquake 3 km S of Blanchard, Oklahoma

A magnitude 1.9 earthquake struck 3 km S of Blanchard, Oklahoma on Sun, Sep 19, 2021, 10:56 PM CDT (03:56 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M2.8 8 km SSW of Warwick, 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
1.88	ML, local (Richter)	Oklahoma Geological Survey	Preferred · Confirmed · ±0.22 · 35 stations
2.0	mb_Lg, Lg-wave body	USGS National Earthquake Information Center	Reviewed · ±0.193 · 7 stations

11 people reported to the USGS what they felt; the strongest reported shaking was IV, light 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: 31 in the 60 days after this one and 13 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event ok2021skzp (also filed as us7000fcsx). Read Thu, Oct 1, 2026, 5:05 PM UTC.