Arkansas earthquakes

M4.1 earthquake 4 km NNE of Greenbrier, Arkansas

A magnitude 4.1 earthquake struck 4 km NNE of Greenbrier, Arkansas on Fri, Feb 18, 2011, 2:13 AM CST (08:13 UTC), 6 km (4 mi) below the surface.

Greenbrier forecast More in Arkansas

Map

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

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The earthquake

Magnitude: 4.1 (mw), light
Local time: Fri, Feb 18, 2011, 2:13 AM CST
UTC: 2011-02-18 08:13:35 UTC
Depth: 6.2 km (3.9 mi), shallow
Epicenter: 35.271° N, 92.377° W
Region: Arkansas
Felt reports: 447
Strongest shaking: V, moderate shaking
PAGER alert: Green
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

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

Strongest estimated: V, moderate shaking
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

447 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

Estimated impact

The USGS PAGER system estimates deaths and economic losses from the shaking and the population and buildings exposed to it.

Alert level: Green: little or no damage or loss of life expected

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Strike-slip
Nodal plane 1: Strike 198°, dip 72°, rake 163°
Nodal plane 2: Strike 293°, dip 74°, rake 19°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 0.5 km horizontally, 0.4 km in depth
Magnitude uncertainty: ±0.82
Depth from: From location
Station coverage gap: 74°
Stations used: 16

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 200 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 200.

Earthquakes today Arkansas earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nm608397 (also filed as nm1182, usp000hupq). Read Tue, Sep 22, 2026, 10:50 AM UTC.