M1.9 earthquake 4 km NE of Greenbrier, Arkansas

A magnitude 1.9 earthquake struck 4 km NE of Greenbrier, Arkansas on Tue, Mar 29, 2011, 3:29 PM CDT (20:29 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M3.9 3 km NE of Greenbrier, Arkansas. 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
1.9	Md, duration	NM	Preferred · Reviewed · ±0.126 · 3 stations
1.9	Md, duration	USGS National Earthquake Information Center	Reviewed

The USGS’s account of the effects of this earthquake.

Felt at Conway.

From the USGS event page for nm608741. U.S. Geological Survey text and figures are in the public domain.

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 156 in the 60 days after this one and at least 200 in the 30 days before it.

The first 60 of 156.

From the USGS Earthquake Hazards Program and its partner networks, event nm608741 (also filed as usp000hyw7). Read Sat, Oct 3, 2026, 10:48 PM UTC.